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Use feature(const_fn_trait_bound) instead of feature(const_fn)
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    error[E0658]: trait bounds other than `Sized` on const fn parameters are unstable
      --> examples/const_fn_test/tests/test.rs:11:6
       |
    11 | impl<T: IntoIterator> A<T> {
       |      ^
       |
       = note: see issue #57563 <rust-lang/rust#57563> for more information
       = help: add `#![feature(const_fn_trait_bound)]` to the crate attributes to enable
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taiki-e committed Apr 30, 2021
1 parent 68a1101 commit dfeddd9
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2 changes: 1 addition & 1 deletion examples/const_fn_test/tests/test.rs
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
#![cfg_attr(nightly, feature(const_fn))]
#![cfg_attr(nightly, feature(const_fn_trait_bound))]
#![warn(rust_2018_idioms, single_use_lifetimes)]
#![allow(dead_code)]

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