assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32
dwrensha opened this issue · 4 comments
dwrensha commented
$ echo -n 'fn f(){(print!(á' > bug.rs
$ rustc bug.rs
error: this file contains an unclosed delimiter
--> bug.rs:1:17
|
1 | fn f(){(print!(á
| -- - ^
| || |
| || unclosed delimiter
| |unclosed delimiter
| unclosed delimiter
error: format argument must be a string literal
--> bug.rs:1:16
|
1 | fn f(){(print!(á
| ^
|
help: you might be missing a string literal to format with
|
1 | fn f(){(print!("{}", á
| +++++
thread 'rustc' panicked at 'assertion failed: bpos.to_u32() >= mbc.pos.to_u32() + mbc.bytes as u32', compiler/rustc_span/src/lib.rs:1710:17
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
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/issues/new?labels=C-bug%2C+I-ICE%2C+T-compiler&template=ice.md
note: rustc 1.59.0-nightly (83b15bfe1 2021-12-28) running on x86_64-unknown-linux-gnu
query stack during panic:
end of query stack
error: aborting due to 2 previous errors
Reported by @Badel2 here: #92267 (comment)
(Note that #92460 fixes #92267, but does not fix this bug.)
dwrensha commented
searched nightlies: from nightly-2021-01-07 to nightly-2021-12-24
regressed nightly: nightly-2021-09-12
searched commits: from b69fe57 to 8c2b6ea
regressed commit: 43769af
bisected with cargo-bisect-rustc v0.6.0
Host triple: x86_64-unknown-linux-gnu
Reproduce with:
cargo bisect-rustc --start=2021-1-7 --end=2021-12-24 --regress ice dwrensha commented
Not a fix, but if I make this change
diff --git a/compiler/rustc_lint/src/unused.rs b/compiler/rustc_lint/src/unused.rs
index 755e24d5413..a74a83567a3 100644
--- a/compiler/rustc_lint/src/unused.rs
+++ b/compiler/rustc_lint/src/unused.rs
@@ -512,7 +512,7 @@ fn emit_unused_delims_expr(
if value.span.from_expansion() || expr.span.from_expansion() {
(
value.span.with_hi(value.span.lo() + BytePos(1)),
- value.span.with_lo(value.span.hi() - BytePos(1)),
+ value.span.with_lo(value.span.hi()),
)
} else {
(value.span.with_hi(expr.span.lo()), value.span.with_lo(expr.span.hi()))
then there is no longer an ICE and I get
error: this file contains an unclosed delimiter
--> /home/dwrensha/Desktop/bug.rs:1:17
|
1 | fn f(){(print!(á
| -- - ^
| || |
| || unclosed delimiter
| |unclosed delimiter
| unclosed delimiter
error: format argument must be a string literal
--> /home/dwrensha/Desktop/bug.rs:1:16
|
1 | fn f(){(print!(á
| ^
|
help: you might be missing a string literal to format with
|
1 | fn f(){(print!("{}", á
| +++++
warning: unnecessary parentheses around block return value
--> /home/dwrensha/Desktop/bug.rs:1:8
|
1 | fn f(){(print!(á
| ^ ^
|
= note: `#[warn(unused_parens)]` on by default
help: remove these parentheses
|
1 - fn f(){(print!(á
1 + fn f(){print!(á
|
error: aborting due to 2 previous errors; 1 warning emitted