Fix the ordering of unsafe and extern in methods
#19418
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This breaks code that looks like this:
trait Foo {
extern "C" unsafe fn foo();
}
impl Foo for Bar {
extern "C" unsafe fn foo() { ... }
}
Change such code to look like this:
trait Foo {
unsafe extern "C" fn foo();
}
impl Foo for Bar {
unsafe extern "C" fn foo() { ... }
}
Fixes rust-lang#19398.
[breaking-change]
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Fixes #19398.