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fix(middle): emit error rather than delay bug when reaching limit

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This commit is contained in:
bohan 2023-04-02 18:50:01 +08:00
parent a93bcdc307
commit d8a4e7cf51
6 changed files with 26 additions and 81 deletions
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52
tests/ui/autoref-autoderef/issue-38940.rs
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@ -1,52 +0,0 @@
// issue-38940: error printed twice for deref recursion limit exceeded
// Test that the recursion limit can be changed. In this case, we have
// deeply nested types that will fail the `Send` check by overflow
// when the recursion limit is set very low.
// compile-flags: -Zdeduplicate-diagnostics=yes
#![allow(dead_code)]
#![recursion_limit = "10"]
macro_rules! link {
($outer:ident, $inner:ident) => {
struct $outer($inner);
impl $outer {
fn new() -> $outer {
$outer($inner::new())
}
}
impl std::ops::Deref for $outer {
type Target = $inner;
fn deref(&self) -> &$inner {
&self.0
}
}
};
}
struct Bottom;
impl Bottom {
fn new() -> Bottom {
Bottom
}
}
link!(Top, A);
link!(A, B);
link!(B, C);
link!(C, D);
link!(D, E);
link!(E, F);
link!(F, G);
link!(G, H);
link!(H, I);
link!(I, J);
link!(J, K);
link!(K, Bottom);
fn main() {
let t = Top::new();
let x: &Bottom = &t;
//~^ ERROR mismatched types
//~| ERROR reached the recursion limit while auto-dereferencing `J`
}

23
tests/ui/autoref-autoderef/issue-38940.stderr
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@ -1,23 +0,0 @@
error[E0055]: reached the recursion limit while auto-dereferencing `J`
--> $DIR/issue-38940.rs:49:22
|
LL | let x: &Bottom = &t;
| ^^ deref recursion limit reached
|
= help: consider increasing the recursion limit by adding a `#![recursion_limit = "20"]` attribute to your crate (`issue_38940`)
error[E0308]: mismatched types
--> $DIR/issue-38940.rs:49:22
|
LL | let x: &Bottom = &t;
| ------- ^^ expected `&Bottom`, found `&Top`
| |
| expected due to this
|
= note: expected reference `&Bottom`
found reference `&Top`
error: aborting due to 2 previous errors
Some errors have detailed explanations: E0055, E0308.
For more information about an error, try `rustc --explain E0055`.

6
tests/ui/did_you_mean/recursion_limit_deref.stderr
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@ -1,3 +1,7 @@
error: reached the recursion limit finding the struct tail for `Bottom`
|
= help: consider increasing the recursion limit by adding a `#![recursion_limit = "20"]`
error[E0055]: reached the recursion limit while auto-dereferencing `J`
--> $DIR/recursion_limit_deref.rs:51:22
|
@ -17,7 +21,7 @@ LL | let x: &Bottom = &t;
= note: expected reference `&Bottom`
found reference `&Top`
error: aborting due to 2 previous errors
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0055, E0308.
For more information about an error, try `rustc --explain E0055`.