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Rollup merge of rust-lang#117389 - oli-obk:gen_fn, r=compiler-errors
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Some diagnostics improvements of `gen` blocks

These are leftovers from rust-lang#116447
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matthiaskrgr authored Oct 30, 2023
2 parents b4269e1 + bc926f7 commit 399aae3
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Showing 9 changed files with 48 additions and 10 deletions.
2 changes: 2 additions & 0 deletions compiler/rustc_middle/messages.ftl
Original file line number Diff line number Diff line change
Expand Up @@ -12,6 +12,8 @@ middle_assert_coroutine_resume_after_return = coroutine resumed after completion
middle_assert_divide_by_zero =
attempt to divide `{$val}` by zero
middle_assert_gen_resume_after_panic = `gen` fn or block cannot be further iterated on after it panicked
middle_assert_misaligned_ptr_deref =
misaligned pointer dereference: address must be a multiple of {$required} but is {$found}
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3 changes: 1 addition & 2 deletions compiler/rustc_middle/src/mir/terminator.rs
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Expand Up @@ -250,8 +250,7 @@ impl<O> AssertKind<O> {
middle_assert_coroutine_resume_after_return
}
ResumedAfterPanic(CoroutineKind::Async(_)) => middle_assert_async_resume_after_panic,
// FIXME(gen_blocks): custom error message for `gen` blocks
ResumedAfterPanic(CoroutineKind::Gen(_)) => middle_assert_async_resume_after_panic,
ResumedAfterPanic(CoroutineKind::Gen(_)) => middle_assert_gen_resume_after_panic,
ResumedAfterPanic(CoroutineKind::Coroutine) => {
middle_assert_coroutine_resume_after_panic
}
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4 changes: 2 additions & 2 deletions compiler/rustc_parse/messages.ftl
Original file line number Diff line number Diff line change
Expand Up @@ -278,8 +278,8 @@ parse_found_expr_would_be_stmt = expected expression, found `{$token}`
parse_function_body_equals_expr = function body cannot be `= expression;`
.suggestion = surround the expression with `{"{"}` and `{"}"}` instead of `=` and `;`
parse_gen_block = `gen` blocks are not yet implemented
.help = only the keyword is reserved for now
parse_gen_fn = `gen` functions are not yet implemented
.help = for now you can use `gen {"{}"}` blocks and return `impl Iterator` instead
parse_generic_args_in_pat_require_turbofish_syntax = generic args in patterns require the turbofish syntax
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4 changes: 2 additions & 2 deletions compiler/rustc_parse/src/errors.rs
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Expand Up @@ -521,9 +521,9 @@ pub(crate) struct CatchAfterTry {
}

#[derive(Diagnostic)]
#[diag(parse_gen_block)]
#[diag(parse_gen_fn)]
#[help]
pub(crate) struct GenBlock {
pub(crate) struct GenFn {
#[primary_span]
pub span: Span,
}
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2 changes: 1 addition & 1 deletion compiler/rustc_parse/src/parser/item.rs
Original file line number Diff line number Diff line change
Expand Up @@ -2372,7 +2372,7 @@ impl<'a> Parser<'a> {
}

if let Gen::Yes { span, .. } = genness {
self.sess.emit_err(errors::GenBlock { span });
self.sess.emit_err(errors::GenFn { span });
}

if !self.eat_keyword_case(kw::Fn, case) {
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25 changes: 25 additions & 0 deletions tests/ui/coroutine/gen_block_panic.rs
Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
//compile-flags: --edition 2024 -Zunstable-options
// run-pass
#![feature(gen_blocks)]

fn main() {
let mut iter = gen {
yield 42;
panic!("foo");
yield 69; //~ WARN: unreachable statement
};
assert_eq!(iter.next(), Some(42));
let mut tmp = std::panic::AssertUnwindSafe(&mut iter);
match std::panic::catch_unwind(move || tmp.next()) {
Ok(_) => unreachable!(),
Err(err) => assert_eq!(*err.downcast::<&'static str>().unwrap(), "foo"),
}

match std::panic::catch_unwind(move || iter.next()) {
Ok(_) => unreachable!(),
Err(err) => assert_eq!(
*err.downcast::<&'static str>().unwrap(),
"`gen fn` should just keep returning `None` after panicking",
),
}
}
12 changes: 12 additions & 0 deletions tests/ui/coroutine/gen_block_panic.stderr
Original file line number Diff line number Diff line change
@@ -0,0 +1,12 @@
warning: unreachable statement
--> $DIR/gen_block_panic.rs:9:9
|
LL | panic!("foo");
| ------------- any code following this expression is unreachable
LL | yield 69;
| ^^^^^^^^^ unreachable statement
|
= note: `#[warn(unreachable_code)]` on by default

warning: 1 warning emitted

4 changes: 2 additions & 2 deletions tests/ui/coroutine/gen_fn.e2024.stderr
Original file line number Diff line number Diff line change
@@ -1,10 +1,10 @@
error: `gen` blocks are not yet implemented
error: `gen` functions are not yet implemented
--> $DIR/gen_fn.rs:4:1
|
LL | gen fn foo() {}
| ^^^
|
= help: only the keyword is reserved for now
= help: for now you can use `gen {}` blocks and return `impl Iterator` instead

error: aborting due to previous error

2 changes: 1 addition & 1 deletion tests/ui/coroutine/gen_fn.rs
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Expand Up @@ -3,6 +3,6 @@

gen fn foo() {}
//[none]~^ ERROR: expected one of `#`, `async`, `const`, `default`, `extern`, `fn`, `pub`, `unsafe`, or `use`, found `gen`
//[e2024]~^^ ERROR: `gen` blocks are not yet implemented
//[e2024]~^^ ERROR: `gen` functions are not yet implemented

fn main() {}

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