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Compiler bug with 'println!' followed by 'fail!' when compiling library #13282

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bvssvni opened this issue Apr 3, 2014 · 3 comments
Closed

Compiler bug with 'println!' followed by 'fail!' when compiling library #13282

bvssvni opened this issue Apr 3, 2014 · 3 comments

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@bvssvni
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bvssvni commented Apr 3, 2014 

// rustc 0.10-pre-nightly (7bda3df 2014-04-02 17:51:48 -0700)
// host: x86_64-apple-darwin
//
// Compile with
//  RUST_BACKTRACE=1 rustc lib.rs --crate-type=rlib

#![allow(unreachable_code)]

pub fn foo() {
    fail!("hello");
    println!("hello");
}

COMPILER ERROR:

error: internal compiler error: encode_symbol: id not found 13
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://static.rust-lang.org/doc/master/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at '~Any', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/libsyntax/diagnostic.rs:123
stack backtrace:
   1:        0x106f425e4 - rt::backtrace::imp::write::h465dd066fae708e1K4b::v0.10.pre
   2:        0x106ea6466 - rt::unwind::begin_unwind_inner::h706b8a82433a867deFb::v0.10.pre
   3:        0x10663cf32 - rt::unwind::begin_unwind::h78c6e0e38e88257f3j2::v0.10.pre
   4:        0x10663db2a - diagnostic::Handler::bug::hed4aac26a1abd0aaYVb::v0.10.pre
   5:        0x104796c2e - metadata::encoder::encode_symbol::hfa747218062fd7deR07::v0.10.pre
   6:        0x1047a20dc - metadata::encoder::encode_info_for_item::he395f425e5fdc83dj48::v0.10.pre
   7:        0x1047a471f - metadata::encoder::my_visit_item::closure.84922
   8:        0x1046d8486 - ast_map::Map::with_path_next::h766f0611a81ad12acVu::v0.10.pre
   9:        0x1046d8454 - ast_map::Map::with_path_next::h766f0611a81ad12acVu::v0.10.pre
  10:        0x1046d8454 - ast_map::Map::with_path_next::h766f0611a81ad12acVu::v0.10.pre
  11:        0x1047a7702 - metadata::encoder::EncodeVisitor$LT$$x27a$C$$x20$x27b$GT$.visit..Visitor$LT$$LP$$RP$$GT$::visit_item::hc83d5b4165d76a87XD9::v0.10.pre
  12:        0x1047a6a91 - visit::walk_decl::h0796691b8f86a337Dwv::v0.10.pre
  13:        0x1047a69be - visit::walk_stmt::h8b4cdaa4d13f25c2rvv::v0.10.pre
  14:        0x1047a6793 - visit::walk_block::h352b671fd4ab74f3mrv::v0.10.pre
  15:        0x1047a5958 - visit::walk_expr::ha9627355b8156d7023u::v0.10.pre
  16:        0x1047a5805 - visit::walk_expr::ha9627355b8156d7023u::v0.10.pre
  17:        0x1047a698f - visit::walk_stmt::h8b4cdaa4d13f25c2rvv::v0.10.pre
  18:        0x1047a6793 - visit::walk_block::h352b671fd4ab74f3mrv::v0.10.pre
  19:        0x1047a7c33 - visit::walk_fn::hebbee6cd8f9e3b69UFv::v0.10.pre
  20:        0x1047a71b1 - metadata::encoder::EncodeVisitor$LT$$x27a$C$$x20$x27b$GT$.visit..Visitor$LT$$LP$$RP$$GT$::visit_item::hc83d5b4165d76a87XD9::v0.10.pre
  21:        0x1047b2871 - metadata::encoder::encode_metadata_inner::hfc230df7a476419b1ca::v0.10.pre
  22:        0x10417baef - metadata::encoder::encode_metadata::h6e5a9b6a4de6d914vca::v0.10.pre
  23:        0x10417aafa - middle::trans::base::write_metadata::h8a372e6fffd01356Krq::v0.10.pre
  24:        0x10417c4a0 - middle::trans::base::trans_crate::hb7feaf7b833fbf06Xvq::v0.10.pre
  25:        0x10485e5ae - driver::driver::phase_4_translate_to_llvm::h70fcfb218b178883aFf::v0.10.pre
  26:        0x10486139d - driver::driver::compile_input::he27246fdf3ebf699ZUf::v0.10.pre
  27:        0x10488671e - run_compiler::hc9b40628b29df06cvyn::v0.10.pre
  28:        0x10489a34d - main_args::closure.92085
  29:        0x104898b62 - monitor::closure.91970
  30:        0x10489470b - task::TaskBuilder::try::closure.91745
  31:        0x10405945c - task::spawn_opts::closure.7920
  32:        0x106f3da08 - rt::task::Task::run::closure.41657
  33:        0x106f483fc - rust_try
  34:        0x106f3d887 - rt::task::Task::run::heda42bba0bf3c293hy9::v0.10.pre
  35:        0x1040592df - task::spawn_opts::closure.7892
  36:        0x106f40fc6 - rt::thread::thread_start::h8efe2212db548d78Yca::v0.10.pre
  37:     0x7fff8ac79899 - _pthread_body
  38:     0x7fff8ac7972a - _pthread_struct_init
@bvssvni bvssvni mentioned this issue Apr 3, 2014
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@klutzy
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klutzy commented Apr 7, 2014

Simplified:

#![allow(dead_code, unreachable_code)]
#![crate_type = "lib"]
pub fn fall() -> ! {
    unsafe { std::cast::transmute(()) }
}

pub fn foo() {
    fall();
    // dead & unreachable from here
    match () {
        () => {
            static A: int = 3;
        }
    }
}

@ghost
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ghost commented Aug 26, 2014

This was fixed in #16452.

@alexcrichton
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It was indeed!

Manishearth pushed a commit to Manishearth/rust that referenced this issue Nov 23, 2022
@bors
Auto merge of rust-lang#13290 - poliorcetics:multiple-targets, r=Veykril
38fa47f 
Support multiple targets for checkOnSave (in conjunction with cargo 1.64.0+)

This PR adds support for the ability to pass multiple `--target` flags when using
`cargo` 1.64.0+.

## Questions

I needed to change the type of two configurations options, but I did not plurialize the names to
avoid too much churn, should I ?

## Zulip thread

https://rust-lang.zulipchat.com/#narrow/stream/185405-t-compiler.2Frust-analyzer/topic/Issue.2013282.20.28supporting.20multiple.20targets.20with.201.2E64.2B.29

## Example

To see it working, on a macOS machine:

```sh
$ cd /tmp
$ cargo new cargo-multiple-targets-support-ra-test
$ cd !$
$ mkdir .cargo
$ echo '
[build]
target = [
    "aarch64-apple-darwin",
    "x86_64-apple-darwin",
]
' > .cargo/config.toml
$ echo '
fn main() {
    #[cfg(all(target_arch = "aarch64", target_os = "macos"))]
    {
        let a = std::fs::read_to_string("/tmp/test-read");
    }

    #[cfg(all(target_arch = "x86_64", target_os = "macos"))]
    {
        let a = std::fs::read_to_string("/tmp/test-read");
    }

    #[cfg(all(target_arch = "x86_64", target_os = "windows"))]
    {
        let a = std::fs::read_to_string("/tmp/test-read");
    }
}
' > src/main.rs
# launch your favorite editor with the version of RA from this PR
#
# You should see warnings under the first two `let a = ...` but not the third
```

## Screen

![Two panes of a terminal emulator, on the left pane is the main.rs file described above, with warnings for the first two let a = declaration, on the right pane is a display of the .cargo/config.toml, an ls of the current files in the directory and a call to cargo build to show the same warnings as in the editor on the left pane](https://user-images.githubusercontent.com/7951708/192122707-7a00606a-e581-4534-b9d5-b81c92694e8e.png)

Helps with rust-lang#13282
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@alexcrichton @klutzy @bvssvni