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57 lines
2.1 KiB
Rust
57 lines
2.1 KiB
Rust
// This test case is exploring the space of how blocks with tail
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// expressions and statements can be composed, trying to keep each
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// case on one line so that we can compare them via a vertical scan
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// with the human eye.
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// Each comment on the right side of the line is summarizing the
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// expected suggestion from the diagnostic for issue #54556.
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fn main() {
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{ let mut _t1 = D(Box::new("t1")); D(&_t1).end() } ; // suggest `;`
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//~^ ERROR does not live long enough
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{ { let mut _t1 = D(Box::new("t1")); D(&_t1).end() } } ; // suggest `;`
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//~^ ERROR does not live long enough
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{ { let mut _t1 = D(Box::new("t1")); D(&_t1).end() }; } // suggest `;`
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//~^ ERROR does not live long enough
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let _ = { let mut _t1 = D(Box::new("t1")); D(&_t1).end() } ; // suggest `;`
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//~^ ERROR does not live long enough
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let _u = { let mut _t1 = D(Box::new("t1")); D(&_t1).unit() } ; // suggest `;`
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//~^ ERROR does not live long enough
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let _x = { let mut _t1 = D(Box::new("t1")); D(&_t1).end() } ; // `let x = ...; x`
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//~^ ERROR does not live long enough
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let _x = { let mut _t1 = D(Box::new("t1")); let x = D(&_t1).end(); x } ; // no error
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let mut _y;
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_y = { let mut _t1 = D(Box::new("t1")); D(&_t1).end() } ; // `let x = ...; x`
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//~^ ERROR does not live long enough
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_y = { let mut _t1 = D(Box::new("t1")); let x = D(&_t1).end(); x } ; // no error
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}
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fn f_param_ref(_t1: D<Box<&'static str>>) { D(&_t1).unit() } // no error
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fn f_local_ref() { let mut _t1 = D(Box::new("t1")); D(&_t1).unit() } // suggest `;`
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//~^ ERROR does not live long enough
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fn f() -> String { let mut _t1 = D(Box::new("t1")); D(&_t1).end() } // `let x = ...; x`
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//~^ ERROR does not live long enough
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#[derive(Debug)]
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struct D<T: std::fmt::Debug>(T);
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impl<T: std::fmt::Debug> Drop for D<T> {
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fn drop(&mut self) {
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println!("dropping {:?})", self);
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}
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}
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impl<T: std::fmt::Debug> D<T> {
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fn next<U: std::fmt::Debug>(&self, _other: U) -> D<U> { D(_other) }
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fn end(&self) -> String { format!("End({:?})", self.0) }
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fn unit(&self) { }
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}
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