diff options
Diffstat (limited to 'src/test/ui/regions/region-borrow-params-issue-29793-small.rs')
| -rw-r--r-- | src/test/ui/regions/region-borrow-params-issue-29793-small.rs | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/src/test/ui/regions/region-borrow-params-issue-29793-small.rs b/src/test/ui/regions/region-borrow-params-issue-29793-small.rs new file mode 100644 index 000000000..5f1c2ed08 --- /dev/null +++ b/src/test/ui/regions/region-borrow-params-issue-29793-small.rs @@ -0,0 +1,212 @@ +// Issue #29793, small regression tests: do not let borrows of +// parameters to ever be returned (expanded with exploration of +// variations). + +// CLOSURES + +fn escaping_borrow_of_closure_params_1() { + let g = |x: usize, y:usize| { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + return f; + }; + + // We delberately do not call `g`; this small version of the test, + // after adding such a call, was (properly) rejected even when the + // system still suffered from issue #29793. + + // g(10, 20)(true); +} + +fn escaping_borrow_of_closure_params_2() { + let g = |x: usize, y:usize| { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + f + }; + + // (we don't call `g`; see above) +} + +fn move_of_closure_params() { + let g = |x: usize, y:usize| { + let f = move |t: bool| if t { x } else { y }; + f; + }; + // (this code is fine, so lets go ahead and ensure rustc accepts call of `g`) + (g(1,2)); +} + +fn ok_borrow_of_fn_params(a: usize, b:usize) { + let g = |x: usize, y:usize| { + let f = |t: bool| if t { a } else { b }; + return f; + }; + // (this code is fine, so lets go ahead and ensure rustc accepts call of `g`) + (g(1,2))(true); +} + +// TOP-LEVEL FN'S + +fn escaping_borrow_of_fn_params_1() { + fn g<'a>(x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + return Box::new(f); + }; + + // (we don't call `g`; see above) +} + +fn escaping_borrow_of_fn_params_2() { + fn g<'a>(x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + Box::new(f) + }; + + // (we don't call `g`; see above) +} + +fn move_of_fn_params() { + fn g<'a>(x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = move |t: bool| if t { x } else { y }; + return Box::new(f); + }; + // (this code is fine, so lets go ahead and ensure rustc accepts call of `g`) + (g(1,2))(true); +} + +// INHERENT METHODS + +fn escaping_borrow_of_method_params_1() { + struct S; + impl S { + fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + return Box::new(f); + } + } + + // (we don't call `g`; see above) +} + +fn escaping_borrow_of_method_params_2() { + struct S; + impl S { + fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + Box::new(f) + } + } + // (we don't call `g`; see above) +} + +fn move_of_method_params() { + struct S; + impl S { + fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = move |t: bool| if t { x } else { y }; + return Box::new(f); + } + } + // (this code is fine, so lets go ahead and ensure rustc accepts call of `g`) + (S.g(1,2))(true); +} + +// TRAIT IMPL METHODS + +fn escaping_borrow_of_trait_impl_params_1() { + trait T { fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a>; } + struct S; + impl T for S { + fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + return Box::new(f); + } + } + + // (we don't call `g`; see above) +} + +fn escaping_borrow_of_trait_impl_params_2() { + trait T { fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a>; } + struct S; + impl T for S { + fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + Box::new(f) + } + } + // (we don't call `g`; see above) +} + +fn move_of_trait_impl_params() { + trait T { fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a>; } + struct S; + impl T for S { + fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = move |t: bool| if t { x } else { y }; + return Box::new(f); + } + } + // (this code is fine, so lets go ahead and ensure rustc accepts call of `g`) + (S.g(1,2))(true); +} + +// TRAIT DEFAULT METHODS + +fn escaping_borrow_of_trait_default_params_1() { + struct S; + trait T { + fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + return Box::new(f); + } + } + impl T for S {} + // (we don't call `g`; see above) +} + +fn escaping_borrow_of_trait_default_params_2() { + struct S; + trait T { + fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = |t: bool| if t { x } else { y }; // (separate errors for `x` vs `y`) + //~^ ERROR E0373 + //~| ERROR E0373 + Box::new(f) + } + } + impl T for S {} + // (we don't call `g`; see above) +} + +fn move_of_trait_default_params() { + struct S; + trait T { + fn g<'a>(&self, x: usize, y:usize) -> Box<dyn Fn(bool) -> usize + 'a> { + let f = move |t: bool| if t { x } else { y }; + return Box::new(f); + } + } + impl T for S {} + // (this code is fine, so lets go ahead and ensure rustc accepts call of `g`) + (S.g(1,2))(true); +} + +fn main() { } |