mirror of https://github.com/rust-lang/rust
62 lines
2.3 KiB
Rust
62 lines
2.3 KiB
Rust
//@ run-pass
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trait Tracked {
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#[track_caller]
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fn track_caller_trait_method(&self, line: u32, col: u32) {
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let location = std::panic::Location::caller();
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assert_eq!(location.file(), file!());
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// The trait method definition is annotated with `#[track_caller]`,
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// so caller location information will work through a method
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// call on a trait object
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assert_eq!(location.line(), line, "Bad line");
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assert_eq!(location.column(), col, "Bad col");
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}
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fn track_caller_not_on_trait_method(&self);
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#[track_caller]
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fn track_caller_through_self(self: Box<Self>, line: u32, col: u32);
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}
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impl Tracked for () {
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// We have `#[track_caller]` on the implementation of the method,
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// but not on the definition of the method in the trait. Therefore,
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// caller location information will *not* work through a method call
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// on a trait object. Instead, we will get the location of this method
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#[track_caller]
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fn track_caller_not_on_trait_method(&self) {
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let location = std::panic::Location::caller();
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assert_eq!(location.file(), file!());
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assert_eq!(location.line(), line!() - 3);
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assert_eq!(location.column(), 5);
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}
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// We don't have a `#[track_caller]` attribute, but
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// `#[track_caller]` is present on the trait definition,
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// so we'll still get location information
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fn track_caller_through_self(self: Box<Self>, line: u32, col: u32) {
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let location = std::panic::Location::caller();
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assert_eq!(location.file(), file!());
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// The trait method definition is annotated with `#[track_caller]`,
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// so caller location information will work through a method
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// call on a trait object
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assert_eq!(location.line(), line, "Bad line");
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assert_eq!(location.column(), col, "Bad col");
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}
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}
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fn main() {
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let tracked: &dyn Tracked = &();
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// The column is the start of 'track_caller_trait_method'
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tracked.track_caller_trait_method(line!(), 13);
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const TRACKED: &dyn Tracked = &();
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// The column is the start of 'track_caller_trait_method'
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TRACKED.track_caller_trait_method(line!(), 13);
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TRACKED.track_caller_not_on_trait_method();
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// The column is the start of `track_caller_through_self`
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let boxed: Box<dyn Tracked> = Box::new(());
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boxed.track_caller_through_self(line!(), 11);
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}
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