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error: tail calls can only be performed with function definitions or pointers
--> $DIR/callee_is_ref.rs:8:12
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LL | become (&f)()
| ^^^^^^
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= note: callee has type `&fn() {f}`
help: consider dereferencing the expression to get a function definition
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LL | become (*(&f))()
| ++ +
error: tail calls can only be performed with function definitions or pointers
--> $DIR/callee_is_ref.rs:14:16
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LL | become fun();
| ^^^^^
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= note: callee has type `&fn()`
help: consider dereferencing the expression to get a function pointer
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LL | become (*fun)();
| ++ +
error: tail calls can only be performed with function definitions or pointers
--> $DIR/callee_is_ref.rs:19:12
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LL | become Box::new(&mut &f)();
| ^^^^^^^^^^^^^^^^^^^
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= note: callee has type `Box<&mut &fn() {f}>`
help: consider dereferencing the expression to get a function definition
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LL | become (***Box::new(&mut &f))();
| ++++ +
error: aborting due to 3 previous errors
|
