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error[E0015]: cannot call non-const closure in constant functions
--> $DIR/issue-56164.rs:1:18
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LL | const fn foo() { (||{})() }
| ^^^^^^^^
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= note: closures need an RFC before allowed to be called in constant functions
= note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
error: function pointer calls are not allowed in constant functions
--> $DIR/issue-56164.rs:6:5
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LL | input()
| ^^^^^^^
error[E0080]: erroneous constant used
--> $DIR/issue-56164.rs:1:18
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LL | const fn foo() { (||{})() }
| ^^^^^^ referenced constant has errors
error: aborting due to 3 previous errors
Some errors have detailed explanations: E0015, E0080.
For more information about an error, try `rustc --explain E0015`.
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