File: non-const-op-const-closure-non-const-outer.stderr

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error[E0015]: cannot call non-const fn `<() as Foo>::foo` in constant functions
  --> $DIR/non-const-op-const-closure-non-const-outer.rs:13:22
   |
LL |     (const || { (()).foo() })();
   |                      ^^^^^
   |
   = note: calls in constant functions are limited to constant functions, tuple structs and tuple variants
   = help: add `#![feature(effects)]` to the crate attributes to enable

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0015`.