mirror of https://github.com/rust-lang/rust
35 lines
722 B
Rust
35 lines
722 B
Rust
//@ build-pass
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//@ compile-flags:-Zpolymorphize=on -Csymbol-mangling-version=v0
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fn foo(f: impl Fn()) {
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// Mutate an upvar from `x` so that it implements `FnMut`.
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let mut outer = 3;
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let mut x = |_: ()| {
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outer = 4;
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()
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};
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// Don't use `f` in `y`, but refer to `x` so that the closure substs contain a reference to
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// `x` that will differ for each instantiation despite polymorphisation of the varying
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// argument.
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let mut y = || x(());
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// Consider `f` used in `foo`.
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f();
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// Use `y` so that it is visited in monomorphisation collection.
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y();
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}
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fn entry_a() {
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foo(|| ());
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}
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fn entry_b() {
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foo(|| ());
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}
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fn main() {
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entry_a();
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entry_b();
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}
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