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117 lines
3.0 KiB
Rust
117 lines
3.0 KiB
Rust
//! Tests where the `#[coverage(..)]` attribute can and cannot be used.
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//@ reference: attributes.coverage.allowed-positions
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#![feature(coverage_attribute)]
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#![feature(extern_types)]
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#![feature(impl_trait_in_assoc_type)]
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#![warn(unused_attributes)]
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#![coverage(off)]
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#[coverage(off)]
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mod submod {}
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#[coverage(off)] //~ ERROR attribute cannot be used on
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type MyTypeAlias = ();
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#[coverage(off)] //~ ERROR attribute cannot be used on
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trait MyTrait {
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#[coverage(off)] //~ ERROR attribute cannot be used on
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const TRAIT_ASSOC_CONST: u32;
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#[coverage(off)] //~ ERROR attribute cannot be used on
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type TraitAssocType;
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#[coverage(off)] //~ ERROR attribute cannot be used on
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fn trait_method(&self);
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#[coverage(off)]
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fn trait_method_with_default(&self) {}
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#[coverage(off)] //~ ERROR attribute cannot be used on
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fn trait_assoc_fn();
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}
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#[coverage(off)]
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impl MyTrait for () {
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const TRAIT_ASSOC_CONST: u32 = 0;
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#[coverage(off)] //~ ERROR attribute cannot be used on
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type TraitAssocType = Self;
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#[coverage(off)]
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fn trait_method(&self) {}
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#[coverage(off)]
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fn trait_method_with_default(&self) {}
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#[coverage(off)]
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fn trait_assoc_fn() {}
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}
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trait HasAssocType {
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type T;
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fn constrain_assoc_type() -> Self::T;
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}
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impl HasAssocType for () {
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#[coverage(off)] //~ ERROR attribute cannot be used on
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type T = impl Copy;
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fn constrain_assoc_type() -> Self::T {}
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}
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#[coverage(off)] //~ ERROR attribute cannot be used on
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struct MyStruct {
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#[coverage(off)] //~ ERROR attribute cannot be used on
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field: u32,
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}
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#[coverage(off)]
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impl MyStruct {
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#[coverage(off)]
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fn method(&self) {}
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#[coverage(off)]
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fn assoc_fn() {}
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}
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extern "C" {
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#[coverage(off)] //~ ERROR attribute cannot be used on
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static X: u32;
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#[coverage(off)] //~ ERROR attribute cannot be used on
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type T;
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#[coverage(off)] //~ ERROR attribute cannot be used on
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fn foreign_fn();
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}
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#[coverage(off)]
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fn main() {
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#[coverage(off)] //~ ERROR attribute cannot be used on
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let _ = ();
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// Currently not allowed on let statements, even if they bind to a closure.
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// It might be nice to support this as a special case someday, but trying
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// to define the precise boundaries of that special case might be tricky.
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#[coverage(off)] //~ ERROR attribute cannot be used on
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let _let_closure = || ();
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// In situations where attributes can already be applied to expressions,
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// the coverage attribute is allowed on closure expressions.
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let _closure_tail_expr = {
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#[coverage(off)]
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|| ()
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};
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// Applying attributes to arbitrary expressions requires an unstable
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// feature, but if that feature were enabled then this would be allowed.
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let _closure_expr = #[coverage(off)] || ();
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//~^ ERROR attributes on expressions are experimental [E0658]
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match () {
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#[coverage(off)] //~ ERROR attribute cannot be used on
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() => (),
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}
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#[coverage(off)] //~ ERROR attribute cannot be used on
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return ();
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}
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