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Diffstat (limited to 'crates/ide-diagnostics/src/handlers/mutability_errors.rs')
| -rw-r--r-- | crates/ide-diagnostics/src/handlers/mutability_errors.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/crates/ide-diagnostics/src/handlers/mutability_errors.rs b/crates/ide-diagnostics/src/handlers/mutability_errors.rs index 96470265d1..03951ea2bf 100644 --- a/crates/ide-diagnostics/src/handlers/mutability_errors.rs +++ b/crates/ide-diagnostics/src/handlers/mutability_errors.rs @@ -632,6 +632,31 @@ fn f(inp: (Foo, Foo, Foo, Foo)) { } #[test] + fn fn_traits() { + check_diagnostics( + r#" +//- minicore: fn +fn fn_ref(mut x: impl Fn(u8) -> u8) -> u8 { + //^^^^^ 💡 weak: variable does not need to be mutable + x(2) +} +fn fn_mut(x: impl FnMut(u8) -> u8) -> u8 { + x(2) + //^ 💡 error: cannot mutate immutable variable `x` +} +fn fn_borrow_mut(mut x: &mut impl FnMut(u8) -> u8) -> u8 { + //^^^^^ 💡 weak: variable does not need to be mutable + x(2) +} +fn fn_once(mut x: impl FnOnce(u8) -> u8) -> u8 { + //^^^^^ 💡 weak: variable does not need to be mutable + x(2) +} +"#, + ); + } + + #[test] fn respect_allow_unused_mut() { // FIXME: respect check_diagnostics( |