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47 lines
1.1 KiB
Rust
47 lines
1.1 KiB
Rust
// Issue 34101: Circa 2016-06-05, `fn inline` below issued an
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// erroneous warning from the elaborate_drops pass about moving out of
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// a field in `Foo`, which has a destructor (and thus cannot have
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// content moved out of it). The reason that the warning is erroneous
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// in this case is that we are doing a *replace*, not a move, of the
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// content in question, and it is okay to replace fields within `Foo`.
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//
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// Another more subtle problem was that the elaborate_drops was
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// creating a separate drop flag for that internally replaced content,
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// even though the compiler should enforce an invariant that any drop
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// flag for such subcontent of `Foo` will always have the same value
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// as the drop flag for `Foo` itself.
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// check-pass
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struct Foo(String);
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impl Drop for Foo {
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fn drop(&mut self) {}
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}
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fn inline() {
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// (dummy variable so `f` gets assigned `var1` in MIR for both fn's)
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let _s = ();
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let mut f = Foo(String::from("foo"));
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f.0 = String::from("bar");
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}
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fn outline() {
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let _s = String::from("foo");
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let mut f = Foo(_s);
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f.0 = String::from("bar");
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}
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fn main() {
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inline();
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outline();
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}
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