Project fails (or takes long time) to compile on latest stable and nightly (hang/stackoverflow)

While attempting to compile my application (or simply run cargo check), rustc will crash, with slightly different results depending on whether it's the stable or nightly branch.

OS: Windows 10 x64 version 1809 build 17763.253

stable toolchain

stable-x86_64-pc-windows-msvc
rustc 1.32.0 (9fda7c2 2019-01-16)

cargo check result: thread 'main' has overflowed its stack

Repro steps

Clone my project
cd rs-nes
git checkout remove-unstable-features
cargo check

nightly toolchain

nightly-x86_64-pc-windows-msvc
rustc 1.33.0-nightly (daa53a5 2019-01-17)

cargo check result: Process finished with exit code -1

Repro steps

Same as above, but on the master branch

Suspected cause

I've narrowed down the issue to a procedural macro that I've had no issues compiling in the past (on nightly). It generates a large match statement which made me think that this recent change may be related, but I have no evidence to support it other than the fact that it changes how the compiler behaves wrt large match statements.

It's also worth noting that I created the remove-unstable-features branch specifically to see if this was only an issue on nightly. It's possible that the error seen on stable is a manifestation of not using unstable features I had been relying on (box patterns, in this case).

I've had no issues compiling in the past (on nightly)

Is there perhaps at least a vague idea of what nightly it was that used to work well?

I can confirm that cargo check succeeds on the following toolchains (apologies, I should have checked on my un-updated laptops prior to submitting this ticket!):

master branch:

nightly-x86_64-pc-windows-msvc (1.33.0-nightly a2b0f24 2018-12-30)
nightly-x86_64-apple-darwin (rustc 1.33.0 nightly c2d381d 2019-01-10)

remove-unstable-features branch

stable-x86_64-pc-windows-msvc (rustc 1.31.1 b6c32da 2018-12-18)
stable-x86_x64-apple-darwin (rustc 1.31.1 b6c32da 2018-12-18)

Does not reproduce on Linux.

Updated my toolchains on OS X, was able to reproduce on stable, on nightly it succeeded but takes an incredibly long time (12 minutes, 41 seconds on 2.2ghz Intel i7)

Unable to reproduce. I am also on linux. (triple: x86_64-unknown-linux-gnu)

git clone https://github.com/bgourlie/rs-nes.git
cd rs-nes
git checkout 4d98499f # HEAD of remove-unstable-features at time of posting
cargo +stable check # using rustc 1.32.0 (9fda7c223 2019-01-16)

Also unable to reproduce on Linux (WSL).

Okay. I can confirm that it takes a suspiciously long time to cargo check on nightly even on linux (either on rs-nes master or remove-unstable-features). It does eventually finish successfully.

I attached gdb to a running process and sampled some backtraces:

cargo check gdb backtraces (nightly rustc daa53a5, rs-nes 4d98499f (remove-unstable-features))

Thread 2 (Thread 0x7fa8a6fff700 (LWP 14924)):
#0  0x00007fa89ce685ea in <proc_macro::TokenStream as core::iter::traits::Extend<proc_macro::TokenStream>>::extend (self=0x7fa8a6fedb34, streams=...)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libproc_macro/lib.rs:179
#1  0x00007fa89ce69284 in <proc_macro2::imp::TokenStream as core::iter::traits::Extend<proc_macro2::TokenTree>>::extend (self=0x7fa8a6fedb30, streams=...)
    at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.24/src/unstable.rs:245
#2  0x00007fa89ce6766b in <proc_macro2::TokenStream as core::iter::traits::Extend<proc_macro2::TokenTree>>::extend (self=0x7fa8a6fedb30, streams=...)
    at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.24/src/lib.rs:170
#3  0x00007fa89ce67d9b in <proc_macro2::TokenStream as quote::ext::TokenStreamExt>::append (self=0x7fa8a6fedb30, token=...)
    at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-0.6.10/src/ext.rs:41
#4  0x00007fa89ce5fcea in quote::__rt::push_comma (tokens=0x7fa8a6fedb30, span=...)
    at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-0.6.10/src/lib.rs:163
#5  0x00007fa89ce47518 in rs_nes_macros::ppu_loop_impl () at rs-nes-macros/src/lib.rs:155
#6  0x00007fa89ce53fb3 in rs_nes_macros::ppu_loop (input=...) at rs-nes-macros/src/lib.rs:490
#7  0x00007fa8a872cdc8 in proc_macro::bridge::client::__run_expand2::{{closure}}::{{closure}} () at src/libproc_macro/bridge/client.rs:409
#8  <proc_macro::bridge::scoped_cell::ScopedCell<T>>::set::{{closure}} () at src/libproc_macro/bridge/scoped_cell.rs:78
#9  <proc_macro::bridge::scoped_cell::ScopedCell<T>>::replace () at src/libproc_macro/bridge/scoped_cell.rs:73
#10 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::set () at src/libproc_macro/bridge/scoped_cell.rs:78
#11 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::enter::{{closure}} () at src/libproc_macro/bridge/client.rs:306
#12 <std::thread::local::LocalKey<T>>::try_with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:299
#13 <std::thread::local::LocalKey<T>>::with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:245
#14 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::enter () at src/libproc_macro/bridge/client.rs:306
#15 proc_macro::bridge::client::__run_expand2::{{closure}} () at src/libproc_macro/bridge/client.rs:401
#16 <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once ()
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panic.rs:309
#17 std::panicking::try::do_call () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panicking.rs:297
#18 0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#19 0x00007fa8a8732d75 in std::panicking::try () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panicking.rs:276
#20 std::panic::catch_unwind () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panic.rs:388
#21 proc_macro::bridge::client::__run_expand2 () at src/libproc_macro/bridge/client.rs:400
#22 0x00007fa8abc74d1e in proc_macro::bridge::server::run_server ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#23 0x00007fa8abc384b7 in proc_macro::bridge::server::<impl proc_macro::bridge::client::Client<fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream>>::run () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#24 0x00007fa8abcfb4a5 in <syntax_ext::proc_macro_impl::AttrProcMacro as syntax::ext::base::AttrProcMacro>::expand ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#25 0x00007fa8a943cb84 in syntax::ext::expand::MacroExpander::expand_invoc ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#26 0x00007fa8a94364de in syntax::ext::expand::MacroExpander::expand_fragment ()
--Type <RET> for more, q to quit, c to continue without paging--
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#27 0x00007fa8a9435624 in syntax::ext::expand::MacroExpander::expand_crate ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#28 0x00007fa8ae3d86a5 in rustc_driver::driver::phase_2_configure_and_expand_inner::{{closure}} ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#29 0x00007fa8ae3cf72d in rustc::util::common::time ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#30 0x00007fa8ae436f4e in rustc_driver::driver::phase_2_configure_and_expand ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#31 0x00007fa8ae432842 in rustc_driver::driver::compile_input ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#32 0x00007fa8ae38ec21 in rustc_driver::run_compiler_with_pool ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#33 0x00007fa8ae39afc6 in <scoped_tls::ScopedKey<T>>::set ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#34 0x00007fa8ae38da6b in rustc_driver::run_compiler ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#35 0x00007fa8ae39a9bb in <scoped_tls::ScopedKey<T>>::set ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#36 0x00007fa8ae40d343 in std::sys_common::backtrace::__rust_begin_short_backtrace ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#37 0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#38 0x00007fa8ae424ec1 in <F as alloc::boxed::FnBox<A>>::call_box ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#39 0x00007fa8ae06a2ae in _$LT$alloc..boxed..Box$LT$$LP$dyn$u20$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$RP$$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$::call_once::hd0c21f6d144d255f () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/liballoc/boxed.rs:744
#40 std::sys_common::thread::start_thread () at src/libstd/sys_common/thread.rs:14
#41 std::sys::unix::thread::Thread::new::thread_start () at src/libstd/sys/unix/thread.rs:81
#42 0x00007fa8adf93a9d in start_thread () from /usr/lib/libpthread.so.0
#43 0x00007fa8adeb4b23 in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7fa8a790e380 (LWP 14923)):
#0  0x00007fa8adf94f6d in __pthread_timedjoin_ex () from /usr/lib/libpthread.so.0
#1  0x00007fa8ae06a36d in std::sys::unix::thread::Thread::join () at src/libstd/sys/unix/thread.rs:168
#2  0x00007fa8ae40e1b3 in <std::thread::JoinHandle<T>>::join ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#3  0x00007fa8ae38ba39 in rustc_driver::run ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#4  0x00007fa8ae3998fc in rustc_driver::main ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#5  0x00005589dd3ac453 in std::rt::lang_start::{{closure}} ()
#6  0x00007fa8ae059863 in std::rt::lang_start_internal::{{closure}} () at src/libstd/rt.rs:49
#7  std::panicking::try::do_call () at src/libstd/panicking.rs:297
#8  0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#9  0x00007fa8ae05a476 in std::panicking::try () at src/libstd/panicking.rs:276
#10 std::panic::catch_unwind () at src/libstd/panic.rs:388
#11 std::rt::lang_start_internal () at src/libstd/rt.rs:48
#12 0x00005589dd3ac442 in main ()

========================================================================

Thread 2 (Thread 0x7fa8a6fff700 (LWP 14924)):
#0  0x00007fa89ce685ea in <proc_macro::TokenStream as core::iter::traits::Extend<proc_macro::TokenStream>>::extend (self=0x7fa8a6fedb34, streams=...)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libproc_macro/lib.rs:179
#1  0x00007fa89ce69284 in <proc_macro2::imp::TokenStream as core::iter::traits::Extend<proc_macro2::TokenTree>>::extend (self=0x7fa8a6fedb30, streams=...)
    at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.24/src/unstable.rs:245
#2  0x00007fa89ce6766b in <proc_macro2::TokenStream as core::iter::traits::Extend<proc_macro2::TokenTree>>::extend (self=0x7fa8a6fedb30, streams=...)
    at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.24/src/lib.rs:170
#3  0x00007fa89ce67d9b in <proc_macro2::TokenStream as quote::ext::TokenStreamExt>::append (self=0x7fa8a6fedb30, token=...)
    at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-0.6.10/src/ext.rs:41
#4  0x00007fa89ce5fcea in quote::__rt::push_comma (tokens=0x7fa8a6fedb30, span=...)
    at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-0.6.10/src/lib.rs:163
#5  0x00007fa89ce47518 in rs_nes_macros::ppu_loop_impl () at rs-nes-macros/src/lib.rs:155
#6  0x00007fa89ce53fb3 in rs_nes_macros::ppu_loop (input=...) at rs-nes-macros/src/lib.rs:490
#7  0x00007fa8a872cdc8 in proc_macro::bridge::client::__run_expand2::{{closure}}::{{closure}} () at src/libproc_macro/bridge/client.rs:409
#8  <proc_macro::bridge::scoped_cell::ScopedCell<T>>::set::{{closure}} () at src/libproc_macro/bridge/scoped_cell.rs:78
#9  <proc_macro::bridge::scoped_cell::ScopedCell<T>>::replace () at src/libproc_macro/bridge/scoped_cell.rs:73
#10 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::set () at src/libproc_macro/bridge/scoped_cell.rs:78
#11 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::enter::{{closure}} () at src/libproc_macro/bridge/client.rs:306
#12 <std::thread::local::LocalKey<T>>::try_with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:299
#13 <std::thread::local::LocalKey<T>>::with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:245
#14 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::enter () at src/libproc_macro/bridge/client.rs:306
#15 proc_macro::bridge::client::__run_expand2::{{closure}} () at src/libproc_macro/bridge/client.rs:401
#16 <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once ()
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panic.rs:309
#17 std::panicking::try::do_call () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panicking.rs:297
#18 0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#19 0x00007fa8a8732d75 in std::panicking::try () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panicking.rs:276
#20 std::panic::catch_unwind () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panic.rs:388
#21 proc_macro::bridge::client::__run_expand2 () at src/libproc_macro/bridge/client.rs:400
#22 0x00007fa8abc74d1e in proc_macro::bridge::server::run_server ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#23 0x00007fa8abc384b7 in proc_macro::bridge::server::<impl proc_macro::bridge::client::Client<fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream>>::run () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#24 0x00007fa8abcfb4a5 in <syntax_ext::proc_macro_impl::AttrProcMacro as syntax::ext::base::AttrProcMacro>::expand ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#25 0x00007fa8a943cb84 in syntax::ext::expand::MacroExpander::expand_invoc ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#26 0x00007fa8a94364de in syntax::ext::expand::MacroExpander::expand_fragment ()
--Type <RET> for more, q to quit, c to continue without paging--c
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#27 0x00007fa8a9435624 in syntax::ext::expand::MacroExpander::expand_crate () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#28 0x00007fa8ae3d86a5 in rustc_driver::driver::phase_2_configure_and_expand_inner::{{closure}} () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#29 0x00007fa8ae3cf72d in rustc::util::common::time () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#30 0x00007fa8ae436f4e in rustc_driver::driver::phase_2_configure_and_expand () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#31 0x00007fa8ae432842 in rustc_driver::driver::compile_input () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#32 0x00007fa8ae38ec21 in rustc_driver::run_compiler_with_pool () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#33 0x00007fa8ae39afc6 in <scoped_tls::ScopedKey<T>>::set () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#34 0x00007fa8ae38da6b in rustc_driver::run_compiler () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#35 0x00007fa8ae39a9bb in <scoped_tls::ScopedKey<T>>::set () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#36 0x00007fa8ae40d343 in std::sys_common::backtrace::__rust_begin_short_backtrace () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#37 0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#38 0x00007fa8ae424ec1 in <F as alloc::boxed::FnBox<A>>::call_box () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#39 0x00007fa8ae06a2ae in _$LT$alloc..boxed..Box$LT$$LP$dyn$u20$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$RP$$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$::call_once::hd0c21f6d144d255f () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/liballoc/boxed.rs:744
#40 std::sys_common::thread::start_thread () at src/libstd/sys_common/thread.rs:14
#41 std::sys::unix::thread::Thread::new::thread_start () at src/libstd/sys/unix/thread.rs:81
#42 0x00007fa8adf93a9d in start_thread () from /usr/lib/libpthread.so.0
#43 0x00007fa8adeb4b23 in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7fa8a790e380 (LWP 14923)):
#0  0x00007fa8adf94f6d in __pthread_timedjoin_ex () from /usr/lib/libpthread.so.0
#1  0x00007fa8ae06a36d in std::sys::unix::thread::Thread::join () at src/libstd/sys/unix/thread.rs:168
#2  0x00007fa8ae40e1b3 in <std::thread::JoinHandle<T>>::join () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#3  0x00007fa8ae38ba39 in rustc_driver::run () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#4  0x00007fa8ae3998fc in rustc_driver::main () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#5  0x00005589dd3ac453 in std::rt::lang_start::{{closure}} ()
#6  0x00007fa8ae059863 in std::rt::lang_start_internal::{{closure}} () at src/libstd/rt.rs:49
#7  std::panicking::try::do_call () at src/libstd/panicking.rs:297
#8  0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#9  0x00007fa8ae05a476 in std::panicking::try () at src/libstd/panicking.rs:276
#10 std::panic::catch_unwind () at src/libstd/panic.rs:388
#11 std::rt::lang_start_internal () at src/libstd/rt.rs:48
#12 0x00005589dd3ac442 in main ()

===============================================

Thread 2 (Thread 0x7fa8a6fff700 (LWP 14924)):
#0  0x00007fa8ade5cc72 in __memmove_sse2_unaligned_erms () from /usr/lib/libc.so.6
#1  0x00005589dd3d5c14 in _rjem_je_large_ralloc (tsdn=<optimized out>, arena=0x0, extent=0x7fa8a4c16700, usize=<optimized out>, alignment=<optimized out>, 
    zero=<optimized out>, tcache=0x7fa8a6ffe0c0)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/src/large.c:299
#2  0x00005589dd3b87bb in _rjem_je_arena_ralloc (tsdn=0x7fa8a6ffdf00, arena=0x0, ptr=<optimized out>, oldsize=<optimized out>, size=<optimized out>, 
    alignment=0, zero=<optimized out>, tcache=0x7fa8a6ffe0c0)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/src/arena.c:1647
#3  0x00005589dd3af964 in iralloct (tsdn=<optimized out>, ptr=<optimized out>, oldsize=<optimized out>, size=<optimized out>, alignment=0, 
    tcache=0x7fa89c430140, arena=0x0, zero=<optimized out>)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/include/jemalloc/internal/jemalloc_internal_inlines_c.h:190
#4  iralloc (tsd=<optimized out>, ptr=<optimized out>, oldsize=<optimized out>, size=<optimized out>, alignment=0, zero=false)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/include/jemalloc/internal/jemalloc_internal_inlines_c.h:197
#5  realloc (ptr=0x7fa89c931340, size=4910400)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/src/jemalloc.c:2338
#6  0x00007fa8a95cae11 in syntax::tokenstream::TokenStream::from_streams ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#7  0x00007fa8a95cf031 in syntax::tokenstream::TokenStreamBuilder::build ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#8  0x00007fa8abcd344d in std::panicking::try::do_call ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#9  0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#10 0x00007fa8abc76a39 in <proc_macro::bridge::server::Dispatcher<proc_macro::bridge::server::MarkedTypes<S>> as proc_macro::bridge::server::DispatcherTrait>::dispatch () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#11 0x00007fa8abcfc813 in <proc_macro::bridge::closure::Closure<'a, A, R> as core::convert::From<&'a mut F>>::from::call ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#12 0x00007fa8a8752d23 in <proc_macro::bridge::closure::Closure<'a, A, R>>::call () at src/libproc_macro/bridge/closure.rs:30
#13 proc_macro::bridge::client::TokenStreamBuilder::build::{{closure}} () at src/libproc_macro/bridge/client.rs:233
#14 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::with::{{closure}} () at src/libproc_macro/bridge/client.rs:317
#15 proc_macro::bridge::client::BridgeState::with::{{closure}}::{{closure}} () at src/libproc_macro/bridge/client.rs:282
#16 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::replace () at src/libproc_macro/bridge/scoped_cell.rs:73
#17 proc_macro::bridge::client::BridgeState::with::{{closure}} () at src/libproc_macro/bridge/client.rs:280
#18 <std::thread::local::LocalKey<T>>::try_with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:299
--Type <RET> for more, q to quit, c to continue without paging--c
#19 <std::thread::local::LocalKey<T>>::with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:245
#20 proc_macro::bridge::client::BridgeState::with () at src/libproc_macro/bridge/client.rs:279
#21 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::with () at src/libproc_macro/bridge/client.rs:310
#22 proc_macro::bridge::client::TokenStreamBuilder::build () at src/libproc_macro/bridge/client.rs:226
#23 0x00007fa89ce68bec in <proc_macro::TokenStream as core::iter::traits::FromIterator<proc_macro::TokenStream>>::from_iter (streams=...) at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libproc_macro/lib.rs:164
#24 0x00007fa89ce62dd1 in core::iter::iterator::Iterator::collect (self=...) at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libcore/iter/iterator.rs:1468
#25 0x00007fa89ce685ea in <proc_macro::TokenStream as core::iter::traits::Extend<proc_macro::TokenStream>>::extend (self=0x7fa8a6fedb34, streams=...) at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libproc_macro/lib.rs:179
#26 0x00007fa89ce69284 in <proc_macro2::imp::TokenStream as core::iter::traits::Extend<proc_macro2::TokenTree>>::extend (self=0x7fa8a6fedb30, streams=...) at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.24/src/unstable.rs:245
#27 0x00007fa89ce6766b in <proc_macro2::TokenStream as core::iter::traits::Extend<proc_macro2::TokenTree>>::extend (self=0x7fa8a6fedb30, streams=...) at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.24/src/lib.rs:170
#28 0x00007fa89ce67d9b in <proc_macro2::TokenStream as quote::ext::TokenStreamExt>::append (self=0x7fa8a6fedb30, token=...) at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-0.6.10/src/ext.rs:41
#29 0x00007fa89ce5fcea in quote::__rt::push_comma (tokens=0x7fa8a6fedb30, span=...) at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-0.6.10/src/lib.rs:163
#30 0x00007fa89ce47518 in rs_nes_macros::ppu_loop_impl () at rs-nes-macros/src/lib.rs:155
#31 0x00007fa89ce53fb3 in rs_nes_macros::ppu_loop (input=...) at rs-nes-macros/src/lib.rs:490
#32 0x00007fa8a872cdc8 in proc_macro::bridge::client::__run_expand2::{{closure}}::{{closure}} () at src/libproc_macro/bridge/client.rs:409
#33 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::set::{{closure}} () at src/libproc_macro/bridge/scoped_cell.rs:78
#34 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::replace () at src/libproc_macro/bridge/scoped_cell.rs:73
#35 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::set () at src/libproc_macro/bridge/scoped_cell.rs:78
#36 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::enter::{{closure}} () at src/libproc_macro/bridge/client.rs:306
#37 <std::thread::local::LocalKey<T>>::try_with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:299
#38 <std::thread::local::LocalKey<T>>::with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:245
#39 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::enter () at src/libproc_macro/bridge/client.rs:306
#40 proc_macro::bridge::client::__run_expand2::{{closure}} () at src/libproc_macro/bridge/client.rs:401
#41 <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panic.rs:309
#42 std::panicking::try::do_call () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panicking.rs:297
#43 0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#44 0x00007fa8a8732d75 in std::panicking::try () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panicking.rs:276
#45 std::panic::catch_unwind () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panic.rs:388
#46 proc_macro::bridge::client::__run_expand2 () at src/libproc_macro/bridge/client.rs:400
#47 0x00007fa8abc74d1e in proc_macro::bridge::server::run_server () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#48 0x00007fa8abc384b7 in proc_macro::bridge::server::<impl proc_macro::bridge::client::Client<fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream>>::run () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#49 0x00007fa8abcfb4a5 in <syntax_ext::proc_macro_impl::AttrProcMacro as syntax::ext::base::AttrProcMacro>::expand () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#50 0x00007fa8a943cb84 in syntax::ext::expand::MacroExpander::expand_invoc () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#51 0x00007fa8a94364de in syntax::ext::expand::MacroExpander::expand_fragment () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#52 0x00007fa8a9435624 in syntax::ext::expand::MacroExpander::expand_crate () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#53 0x00007fa8ae3d86a5 in rustc_driver::driver::phase_2_configure_and_expand_inner::{{closure}} () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#54 0x00007fa8ae3cf72d in rustc::util::common::time () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#55 0x00007fa8ae436f4e in rustc_driver::driver::phase_2_configure_and_expand () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#56 0x00007fa8ae432842 in rustc_driver::driver::compile_input () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#57 0x00007fa8ae38ec21 in rustc_driver::run_compiler_with_pool () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#58 0x00007fa8ae39afc6 in <scoped_tls::ScopedKey<T>>::set () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#59 0x00007fa8ae38da6b in rustc_driver::run_compiler () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#60 0x00007fa8ae39a9bb in <scoped_tls::ScopedKey<T>>::set () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#61 0x00007fa8ae40d343 in std::sys_common::backtrace::__rust_begin_short_backtrace () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#62 0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#63 0x00007fa8ae424ec1 in <F as alloc::boxed::FnBox<A>>::call_box () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#64 0x00007fa8ae06a2ae in _$LT$alloc..boxed..Box$LT$$LP$dyn$u20$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$RP$$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$::call_once::hd0c21f6d144d255f () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/liballoc/boxed.rs:744
#65 std::sys_common::thread::start_thread () at src/libstd/sys_common/thread.rs:14
#66 std::sys::unix::thread::Thread::new::thread_start () at src/libstd/sys/unix/thread.rs:81
#67 0x00007fa8adf93a9d in start_thread () from /usr/lib/libpthread.so.0
#68 0x00007fa8adeb4b23 in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7fa8a790e380 (LWP 14923)):
#0  0x00007fa8adf94f6d in __pthread_timedjoin_ex () from /usr/lib/libpthread.so.0
#1  0x00007fa8ae06a36d in std::sys::unix::thread::Thread::join () at src/libstd/sys/unix/thread.rs:168
#2  0x00007fa8ae40e1b3 in <std::thread::JoinHandle<T>>::join () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#3  0x00007fa8ae38ba39 in rustc_driver::run () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#4  0x00007fa8ae3998fc in rustc_driver::main () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#5  0x00005589dd3ac453 in std::rt::lang_start::{{closure}} ()
#6  0x00007fa8ae059863 in std::rt::lang_start_internal::{{closure}} () at src/libstd/rt.rs:49
#7  std::panicking::try::do_call () at src/libstd/panicking.rs:297
#8  0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#9  0x00007fa8ae05a476 in std::panicking::try () at src/libstd/panicking.rs:276
#10 std::panic::catch_unwind () at src/libstd/panic.rs:388
#11 std::rt::lang_start_internal () at src/libstd/rt.rs:48

===============================================

Thread 2 (Thread 0x7fa8a6fff700 (LWP 14924)):
#0  0x00007fa8ade5cc72 in __memmove_sse2_unaligned_erms () from /usr/lib/libc.so.6
#1  0x00005589dd3d5c14 in _rjem_je_large_ralloc (tsdn=<optimized out>, arena=0x0, extent=0x7fa8a4c16700, usize=<optimized out>, alignment=<optimized out>, 
    zero=<optimized out>, tcache=0x7fa8a6ffe0c0)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/src/large.c:299
#2  0x00005589dd3b87bb in _rjem_je_arena_ralloc (tsdn=0x7fa8a6ffdf00, arena=0x0, ptr=<optimized out>, oldsize=<optimized out>, size=<optimized out>, 
    alignment=0, zero=<optimized out>, tcache=0x7fa8a6ffe0c0)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/src/arena.c:1647
#3  0x00005589dd3af964 in iralloct (tsdn=<optimized out>, ptr=<optimized out>, oldsize=<optimized out>, size=<optimized out>, alignment=0, 
    tcache=0x7fa89c430140, arena=0x0, zero=<optimized out>)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/include/jemalloc/internal/jemalloc_internal_inlines_c.h:190
#4  iralloc (tsd=<optimized out>, ptr=<optimized out>, oldsize=<optimized out>, size=<optimized out>, alignment=0, zero=false)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/include/jemalloc/internal/jemalloc_internal_inlines_c.h:197
#5  realloc (ptr=0x7fa89c931340, size=4910400)
    at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/obj/build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-unknown-linux-gnu/release/build/jemalloc-sys-52018b331c920d2b/out/jemalloc/src/jemalloc.c:2338
#6  0x00007fa8a95cae11 in syntax::tokenstream::TokenStream::from_streams ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#7  0x00007fa8a95cf031 in syntax::tokenstream::TokenStreamBuilder::build ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#8  0x00007fa8abcd344d in std::panicking::try::do_call ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#9  0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#10 0x00007fa8abc76a39 in <proc_macro::bridge::server::Dispatcher<proc_macro::bridge::server::MarkedTypes<S>> as proc_macro::bridge::server::DispatcherTrait>::dispatch () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#11 0x00007fa8abcfc813 in <proc_macro::bridge::closure::Closure<'a, A, R> as core::convert::From<&'a mut F>>::from::call ()
   from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#12 0x00007fa8a8752d23 in <proc_macro::bridge::closure::Closure<'a, A, R>>::call () at src/libproc_macro/bridge/closure.rs:30
#13 proc_macro::bridge::client::TokenStreamBuilder::build::{{closure}} () at src/libproc_macro/bridge/client.rs:233
#14 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::with::{{closure}} () at src/libproc_macro/bridge/client.rs:317
#15 proc_macro::bridge::client::BridgeState::with::{{closure}}::{{closure}} () at src/libproc_macro/bridge/client.rs:282
#16 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::replace () at src/libproc_macro/bridge/scoped_cell.rs:73
#17 proc_macro::bridge::client::BridgeState::with::{{closure}} () at src/libproc_macro/bridge/client.rs:280
#18 <std::thread::local::LocalKey<T>>::try_with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:299
--Type <RET> for more, q to quit, c to continue without paging--c
#19 <std::thread::local::LocalKey<T>>::with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:245
#20 proc_macro::bridge::client::BridgeState::with () at src/libproc_macro/bridge/client.rs:279
#21 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::with () at src/libproc_macro/bridge/client.rs:310
#22 proc_macro::bridge::client::TokenStreamBuilder::build () at src/libproc_macro/bridge/client.rs:226
#23 0x00007fa89ce68bec in <proc_macro::TokenStream as core::iter::traits::FromIterator<proc_macro::TokenStream>>::from_iter (streams=...) at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libproc_macro/lib.rs:164
#24 0x00007fa89ce62dd1 in core::iter::iterator::Iterator::collect (self=...) at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libcore/iter/iterator.rs:1468
#25 0x00007fa89ce685ea in <proc_macro::TokenStream as core::iter::traits::Extend<proc_macro::TokenStream>>::extend (self=0x7fa8a6fedb34, streams=...) at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libproc_macro/lib.rs:179
#26 0x00007fa89ce69284 in <proc_macro2::imp::TokenStream as core::iter::traits::Extend<proc_macro2::TokenTree>>::extend (self=0x7fa8a6fedb30, streams=...) at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.24/src/unstable.rs:245
#27 0x00007fa89ce6766b in <proc_macro2::TokenStream as core::iter::traits::Extend<proc_macro2::TokenTree>>::extend (self=0x7fa8a6fedb30, streams=...) at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/proc-macro2-0.4.24/src/lib.rs:170
#28 0x00007fa89ce67d9b in <proc_macro2::TokenStream as quote::ext::TokenStreamExt>::append (self=0x7fa8a6fedb30, token=...) at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-0.6.10/src/ext.rs:41
#29 0x00007fa89ce5fcea in quote::__rt::push_comma (tokens=0x7fa8a6fedb30, span=...) at /home/lampam/.cargo/registry/src/github.com-1ecc6299db9ec823/quote-0.6.10/src/lib.rs:163
#30 0x00007fa89ce47518 in rs_nes_macros::ppu_loop_impl () at rs-nes-macros/src/lib.rs:155
#31 0x00007fa89ce53fb3 in rs_nes_macros::ppu_loop (input=...) at rs-nes-macros/src/lib.rs:490
#32 0x00007fa8a872cdc8 in proc_macro::bridge::client::__run_expand2::{{closure}}::{{closure}} () at src/libproc_macro/bridge/client.rs:409
#33 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::set::{{closure}} () at src/libproc_macro/bridge/scoped_cell.rs:78
#34 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::replace () at src/libproc_macro/bridge/scoped_cell.rs:73
#35 <proc_macro::bridge::scoped_cell::ScopedCell<T>>::set () at src/libproc_macro/bridge/scoped_cell.rs:78
#36 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::enter::{{closure}} () at src/libproc_macro/bridge/client.rs:306
#37 <std::thread::local::LocalKey<T>>::try_with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:299
#38 <std::thread::local::LocalKey<T>>::with () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/thread/local.rs:245
#39 proc_macro::bridge::client::<impl proc_macro::bridge::Bridge<'_>>::enter () at src/libproc_macro/bridge/client.rs:306
#40 proc_macro::bridge::client::__run_expand2::{{closure}} () at src/libproc_macro/bridge/client.rs:401
#41 <std::panic::AssertUnwindSafe<F> as core::ops::function::FnOnce<()>>::call_once () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panic.rs:309
#42 std::panicking::try::do_call () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panicking.rs:297
#43 0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#44 0x00007fa8a8732d75 in std::panicking::try () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panicking.rs:276
#45 std::panic::catch_unwind () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/libstd/panic.rs:388
#46 proc_macro::bridge::client::__run_expand2 () at src/libproc_macro/bridge/client.rs:400
#47 0x00007fa8abc74d1e in proc_macro::bridge::server::run_server () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#48 0x00007fa8abc384b7 in proc_macro::bridge::server::<impl proc_macro::bridge::client::Client<fn(proc_macro::TokenStream, proc_macro::TokenStream) -> proc_macro::TokenStream>>::run () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#49 0x00007fa8abcfb4a5 in <syntax_ext::proc_macro_impl::AttrProcMacro as syntax::ext::base::AttrProcMacro>::expand () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax_ext-065cea48e300124c.so
#50 0x00007fa8a943cb84 in syntax::ext::expand::MacroExpander::expand_invoc () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#51 0x00007fa8a94364de in syntax::ext::expand::MacroExpander::expand_fragment () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#52 0x00007fa8a9435624 in syntax::ext::expand::MacroExpander::expand_crate () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/../lib/libsyntax-2e8dd76d87693318.so
#53 0x00007fa8ae3d86a5 in rustc_driver::driver::phase_2_configure_and_expand_inner::{{closure}} () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#54 0x00007fa8ae3cf72d in rustc::util::common::time () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#55 0x00007fa8ae436f4e in rustc_driver::driver::phase_2_configure_and_expand () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#56 0x00007fa8ae432842 in rustc_driver::driver::compile_input () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#57 0x00007fa8ae38ec21 in rustc_driver::run_compiler_with_pool () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#58 0x00007fa8ae39afc6 in <scoped_tls::ScopedKey<T>>::set () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#59 0x00007fa8ae38da6b in rustc_driver::run_compiler () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#60 0x00007fa8ae39a9bb in <scoped_tls::ScopedKey<T>>::set () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#61 0x00007fa8ae40d343 in std::sys_common::backtrace::__rust_begin_short_backtrace () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#62 0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#63 0x00007fa8ae424ec1 in <F as alloc::boxed::FnBox<A>>::call_box () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#64 0x00007fa8ae06a2ae in _$LT$alloc..boxed..Box$LT$$LP$dyn$u20$alloc..boxed..FnBox$LT$A$C$$u20$Output$u3d$R$GT$$u20$$u2b$$u20$$u27$a$RP$$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$::call_once::hd0c21f6d144d255f () at /rustc/daa53a52a2667533d5fe59bfcc5b8614b79c3d31/src/liballoc/boxed.rs:744
#65 std::sys_common::thread::start_thread () at src/libstd/sys_common/thread.rs:14
#66 std::sys::unix::thread::Thread::new::thread_start () at src/libstd/sys/unix/thread.rs:81
#67 0x00007fa8adf93a9d in start_thread () from /usr/lib/libpthread.so.0
#68 0x00007fa8adeb4b23 in clone () from /usr/lib/libc.so.6

Thread 1 (Thread 0x7fa8a790e380 (LWP 14923)):
#0  0x00007fa8adf94f6d in __pthread_timedjoin_ex () from /usr/lib/libpthread.so.0
#1  0x00007fa8ae06a36d in std::sys::unix::thread::Thread::join () at src/libstd/sys/unix/thread.rs:168
#2  0x00007fa8ae40e1b3 in <std::thread::JoinHandle<T>>::join () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#3  0x00007fa8ae38ba39 in rustc_driver::run () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#4  0x00007fa8ae3998fc in rustc_driver::main () from /home/lampam/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/bin/../lib/librustc_driver-c5efcb7334989aff.so
#5  0x00005589dd3ac453 in std::rt::lang_start::{{closure}} ()
#6  0x00007fa8ae059863 in std::rt::lang_start_internal::{{closure}} () at src/libstd/rt.rs:49
#7  std::panicking::try::do_call () at src/libstd/panicking.rs:297
#8  0x00007fa8ae06b4ea in __rust_maybe_catch_panic () at src/libpanic_unwind/lib.rs:92
#9  0x00007fa8ae05a476 in std::panicking::try () at src/libstd/panicking.rs:276
#10 std::panic::catch_unwind () at src/libstd/panic.rs:388
#11 std::rt::lang_start_internal () at src/libstd/rt.rs:48
#12 0x00005589dd3ac442 in main ()

When cargo checking with RUSTFLAGS="-Ztime-passes", I can see that the expand crate step takes an unusually big amount of time:

    Checking rs_nes v0.0.1 (/tmp/rs-nes/rs-nes)
  time: 0.009; rss: 54MB	parsing
  time: 0.000; rss: 54MB	attributes injection
  time: 0.000; rss: 54MB	garbage collect incremental cache directory
  time: 0.000; rss: 54MB	recursion limit
  time: 0.000; rss: 54MB	crate injection
  time: 0.000; rss: 54MB	plugin loading
  time: 0.000; rss: 54MB	plugin registration
  time: 0.000; rss: 54MB	background load prev dep-graph
  time: 0.002; rss: 55MB	pre ast expansion lint checks
    time: 176.138; rss: 100MB	expand crate
    time: 0.000; rss: 100MB	check unused macros
  time: 176.138; rss: 100MB	expansion
  time: 0.000; rss: 100MB	maybe building test harness
  time: 0.001; rss: 100MB	maybe creating a macro crate
  time: 0.007; rss: 100MB	creating allocators
  time: 0.004; rss: 100MB	AST validation
  time: 0.016; rss: 102MB	name resolution
  time: 0.003; rss: 102MB	complete gated feature checking
  time: 0.000; rss: 102MB	blocked while dep-graph loading finishes
  time: 0.020; rss: 116MB	lowering ast -> hir
  time: 0.016; rss: 116MB	early lint checks
    time: 0.008; rss: 125MB	validate hir map
  time: 0.051; rss: 125MB	indexing hir
  time: 0.000; rss: 125MB	load query result cache
  time: 0.000; rss: 125MB	looking for entry point
  time: 0.000; rss: 125MB	dep graph tcx init
  time: 0.000; rss: 125MB	looking for plugin registrar
  time: 0.000; rss: 125MB	looking for derive registrar
  time: 0.001; rss: 127MB	loop checking
  time: 0.002; rss: 127MB	attribute checking
  time: 0.004; rss: 127MB	stability checking
  time: 0.010; rss: 131MB	type collecting
  time: 0.000; rss: 131MB	outlives testing
  time: 0.000; rss: 131MB	impl wf inference
  time: 0.045; rss: 142MB	coherence checking
  time: 0.000; rss: 142MB	variance testing

triage. P-high. Assigning to self for further bisection on OS X (to hopefully confirm or reject the reporter's hypothesis regarding #57494

@nnethercote

cc @nnethercote

Okay I think I have a fix.

I made two different micro-optimizations to the code path I identified in my previous comment.

The first micro-optimization was to add a prepass over streams to figure out what capacity our accumulating vec is going to require, and then build the vec with that capacity.
The second micro-optimization (which I suspect may be the more relevant one) was to identify when the Lrc for stream2 has a single owner (i.e. a ref-count of one); if so, then we can just move the trees directly from stream2 into vec, without cloning them.

After rebuilding the compiler with those micro-optimizations, my demo code compiles much faster than before.

Here's the current diff. I'm going to try to identify which of the two micro-optimizations was the important one:

diff --git a/src/libsyntax/tokenstream.rs b/src/libsyntax/tokenstream.rs
index f5d2d6f18e..db6b701b83 100644
--- a/src/libsyntax/tokenstream.rs
+++ b/src/libsyntax/tokenstream.rs
@@ -255,11 +255,19 @@ impl TokenStream {
             0 => TokenStream::empty(),
             1 => streams.pop().unwrap(),
             _ => {
-                let mut vec = vec![];
+                let tree_count = streams.iter()
+                    .map(|ts| match &ts.0 { None => 0, Some(s) => s.len() })
+                    .sum();
+                let mut vec = Vec::with_capacity(tree_count);
                 for stream in streams {
                     match stream.0 {
                         None => {},
-                        Some(stream2) => vec.extend(stream2.iter().cloned()),
+                        Some(stream2) => {
+                            match Lrc::try_unwrap(stream2) {
+                                Ok(trees) => vec.extend(trees.into_iter()),
+                                Err(stream2) => vec.extend(stream2.iter().cloned()),
+                            }
+                        }
                     }
                 }
                 TokenStream::new(vec)

@ExpHP

One mystery to me is why the problem was not replicated on Linux. If I am correct that one or both of the micro-optimizations listed above fixes this issue, then we should be observing a similar execution time hit on Linux systems, I imagine...

~~... although ... maybe it is the with_capacity call that is fixing things on OS X, and memory allocation on Linux is simply so much better than on OS X that it is able to mask the problem there?~~

Update: I overlooked @ExpHP 's report that the slowdown does reproduce on Linux.

Okay I have now determined that on my OS X machine, it is the with_capacity delta that makes the difference here. The attempt to avoid cloning the trees within a singly-owned vector doesn't help at all for my reduced demo.

Well, there were two problems here, right? One that does not replicate on Linux (crash), and one that does (super slow cargo check)

@ExpHP

Oh, I'm sorry, I overlooked @ExpHP 's comment that they reproduced the slowdown on Linux.

cc rust-lang/rustc-perf#277

Just to make sure I cover all the issues here, I have now replicated the stack overflow on OS X atop commit 9fda7c2

A backtrace shows that the overflow is happening during a particularly deep series of drop calls. (Chances seem high that this is related in some manner to how the token-tree/token-stream was (re)structured.)

Rollup merge of rust-lang#58001 - pnkfelix:issue-57735-proc-macro-wit…

Remove `TokenStreamBuilder`.

Navigation Menu

Repository navigation

Project fails (or takes long time) to compile on latest stable and nightly (hang/stackoverflow) #57735

stable toolchain

nightly toolchain

Suspected cause

8 remaining items

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Project fails (or takes long time) to compile on latest stable and nightly (hang/stackoverflow) #57735

Description

stable toolchain

nightly toolchain

Suspected cause

Activity

nagisa commented on Jan 18, 2019

bgourlie commented on Jan 18, 2019

nagisa commented on Jan 18, 2019

bgourlie commented on Jan 18, 2019

ExpHP commented on Jan 18, 2019

bgourlie commented on Jan 18, 2019

ExpHP commented on Jan 18, 2019

matthiaskrgr commented on Jan 19, 2019

pnkfelix commented on Jan 24, 2019

8 remaining items

petrochenkov commented on Jan 29, 2019

pnkfelix commented on Jan 30, 2019

pnkfelix commented on Jan 30, 2019

pnkfelix commented on Jan 30, 2019

ExpHP commented on Jan 30, 2019

pnkfelix commented on Jan 30, 2019

pnkfelix commented on Jan 30, 2019

pnkfelix commented on Jan 31, 2019

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions