659d44a3b4
This commit makes polymorphization visited the MIR of unevaluated constants with available promoted MIR instead of visiting the substitutions of that constant - which will mark all of the generic parameters as used. Signed-off-by: David Wood <david@davidtw.co>
30 lines
832 B
Rust
30 lines
832 B
Rust
// build-fail
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// compile-flags:-Zpolymorphize=on
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#![feature(fn_traits, rustc_attrs, unboxed_closures)]
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// This test checks that the polymorphization analysis considers a closure
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// as using all generic parameters if it does an unsizing cast.
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#[rustc_polymorphize_error]
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fn foo<T: Default>() {
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let _: T = Default::default();
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(|| Box::new(|| {}) as Box<dyn Fn()>)();
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//~^ ERROR item has unused generic parameters
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//~^^ ERROR item has unused generic parameters
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}
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#[rustc_polymorphize_error]
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fn foo2<T: Default>() {
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let _: T = Default::default();
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(|| {
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//~^ ERROR item has unused generic parameters
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let call: extern "rust-call" fn(_, _) = Fn::call;
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call(&|| {}, ());
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//~^ ERROR item has unused generic parameters
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})();
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}
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fn main() {
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foo::<u32>();
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foo2::<u32>();
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}
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