ICE: Trying to invalidate IncrCompSession

[Marwes]

Tried to compile gluon with CARGO_INCREMENTAL but got a ICE when compiling the gluon_check crate (gluon_base and gluon_parser compile fine). I am unsure how to proceed to minimize the ICE.

Only special thing that comes to mind with check/tests/metadata.rs is that there is also base/parser/metadata.rs which I suppose might interfere?

$ RUST_BACKTRACE=1 CARGO_INCREMENTAL=1 cargo test --features test -p gluon_check
   Compiling gluon_check v0.2.2 (file:///home/markus/gluon/check)
error: failed to remove /home/markus/gluon/target/debug/deps/metadata-98e6f654f68aa8ae.metadata.o: No such file or directory (os error 2)

warning: Error finalizing incremental compilation session directory `/home/markus/gluon/target/debug/incremental/metadata-nbuiqqcxwr74/s-emsrkw6mlh-4u3ywp-working`: No such file or directory (os error 2)

error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: run with `RUST_BACKTRACE=1` for a backtrace

thread 'rustc' panicked at '/buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librustc/session/mod.rs:457: Trying to invalidate IncrCompSession `InvalidBecauseOfErrors { session_directory: "/home/markus/gluon/target/debug/incremental/metadata-nbuiqqcxwr74/s-emsrkw6mlh-4u3ywp-working" }`', /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librustc/session/mod.rs:789
stack backtrace:
   1:     0x7f88981dc45c - std::sys::imp::backtrace::tracing::imp::write::hf7294f5e24536b4a
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:42
   2:     0x7f88981ea90e - std::panicking::default_hook::{{closure}}::h9a07d0b00c43fbee
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:351
   3:     0x7f88981ea4b3 - std::panicking::default_hook::hf25feff2d08bf39b
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:361
   4:     0x7f88981eadab - std::panicking::rust_panic_with_hook::h4cb8c6fbb8386ccf
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/panicking.rs:555
   5:     0x7f88951596c2 - std::panicking::begin_panic::h0ee9e71e3a889a8e
   6:     0x7f889530c0ec - rustc::session::opt_span_bug_fmt::{{closure}}::hb77f1c2804eeb101
   7:     0x7f889530bbc5 - rustc::session::opt_span_bug_fmt::h6020528146c503fb
   8:     0x7f889530b822 - rustc::session::bug_fmt::h80c5b006234b3146
   9:     0x7f88953084ab - rustc::session::Session::mark_incr_comp_session_as_invalid::h13d890b8522115b7
  10:     0x7f88975fb7ec - rustc_incremental::persist::fs::finalize_session_directory::h079689918703b64c
  11:     0x7f88985698c9 - rustc_driver::driver::compile_input::hab977ae496b3a6f1
  12:     0x7f88985b3a94 - rustc_driver::run_compiler::h81290683db66a63c
  13:     0x7f88984bfebb - std::panicking::try::do_call::h00942d7a5d04424f
  14:     0x7f88981f3bea - __rust_maybe_catch_panic
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libpanic_unwind/lib.rs:98
  15:     0x7f88984e8122 - <F as alloc::boxed::FnBox<A>>::call_box::hd87f7ab2fccbd670
  16:     0x7f88981e9764 - std::sys::imp::thread::Thread::new::thread_start::hc16926852e47c008
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/liballoc/boxed.rs:624
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys_common/thread.rs:21
                        at /buildslave/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libstd/sys/unix/thread.rs:84
  17:     0x7f888ffa36a9 - start_thread
  18:     0x7f8897e9eeec - clone
  19:                0x0 - <unknown>

error: Could not compile `gluon_check`.

rustc 1.16.0-nightly (eedaa94e3 2017-02-02)
binary: rustc
commit-hash: eedaa94e330094a84f4df9aa52949515327f8e80
commit-date: 2017-02-02
host: x86_64-unknown-linux-gnu
release: 1.16.0-nightly
LLVM version: 3.9

[michaelwoerister]

This really seems to be linked to the metadata file name somehow, but I don't understand how exactly yet.

[Marwes]

This works now as well (as does running CARGO_INCREMENTAL on the rest of gluon). Awesome!