internal compiler error: missing type for const item · Issue #69396 · rust-lang/rust (original) (raw)

I'm seeing an internal compiler error on the following input (found by fuzz-rustc):

macro_rules! suite { ( (( (fn:ident; )* ) => { $( const A = "A".$fn(); )* } }

suite! { len; is_empty; }

fn main() {}

$ rustc src/main.rs
error: internal compiler error: missing type for `const` item
  --> src/main.rs:4:19
   |
4  |               const A = "A".$fn();
   |                     ^ help: provide a type for the item: `A: <type>`
...
9  | / suite! {
10 | |     len;
11 | |     is_empty;
12 | | }
   | |_- in this macro invocation
   |
   = note: src/librustc_errors/lib.rs:456: already existing stashed diagnostic with (span = Span { lo: BytePos(80), hi: BytePos(81), ctxt: #3 }, key = ItemNoType)
   = note: this error: internal compiler error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

thread 'rustc' panicked at 'Box<Any>', src/librustc_errors/lib.rs:461:13
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

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: rustc 1.43.0-nightly (7760cd0fb 2020-02-19) running on x86_64-unknown-linux-gnu

error: missing type for `const` item
  --> src/main.rs:4:19
   |
4  |               const A = "A".$fn();
   |                     ^ help: provide a type for the item: `A: <type>`
...
9  | / suite! {
10 | |     len;
11 | |     is_empty;
12 | | }
   | |_- in this macro invocation
   |
   = note: this error originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 2 previous errors