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Rollup merge of #54413 - memoryruins:deref-error-twice, r=estebank
Add UI test for deref recursion limit printing twice Closes #38940 Does ``NOTE`` in the test need to be changed to ``HELP`` if its in the stderr? ``help: consider adding a `#![recursion_limit="20"]` attribute to your crate`` It doesn't appear to complaining locally that the line isn't set to ``HELP`` in the test, and the guide says > HELP and SUGGESTION* > * Note: SUGGESTION must follow immediately after HELP. yet there's no concrete suggestion emitted. r? @estebank
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// 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. | ||
#![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 I | ||
} |
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error[E0055]: reached the recursion limit while auto-dereferencing I | ||
--> $DIR/issue-38940.rs:43:22 | ||
| | ||
LL | let x: &Bottom = &t; | ||
| ^^ deref recursion limit reached | ||
| | ||
= help: consider adding a `#![recursion_limit="20"]` attribute to your crate | ||
|
||
error[E0308]: mismatched types | ||
--> $DIR/issue-38940.rs:43:22 | ||
| | ||
LL | let x: &Bottom = &t; | ||
| ^^ expected struct `Bottom`, found struct `Top` | ||
| | ||
= note: expected type `&Bottom` | ||
found type `&Top` | ||
|
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error: aborting due to 2 previous errors | ||
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Some errors occurred: E0055, E0308. | ||
For more information about an error, try `rustc --explain E0055`. |