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Non-capturing closures in statics #44669
Description
Now that non-capturing closures can be coerced to function pointers, I really want to do things like this:
struct Foo {
a: fn(u32) -> u32
}
static FOO: Foo = Foo {
a: |x| x*2
};but while it seems to work perfectly, it still returns this warning:
warning: constant evaluation error: unsupported constant expr. This will become a HARD ERROR in the future
--> src/main.rs:7:19
|
7 | static Foo: Foo = Foo {
| ___________________^
8 | | a: |x| x*2
9 | | };
| |_^
|
= note: #[warn(const_err)] on by default
Why would this become an hard error? Is this an error in the lint, or is there a problem in doing this?
Activity
oli-obk commentedon Sep 18, 2017
This is just an oversight that happened when closure -> fn ptr coercion was added.
oli-obk commentedon Mar 16, 2018
This has been fixed in #46882