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error: lifetime parameter `'a` only used once
--> $DIR/fn-types.rs:9:10
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LL | a: for<'a> fn(&'a u32),
| ^^ -- ...is used only here
| |
| this lifetime...
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note: the lint level is defined here
--> $DIR/fn-types.rs:1:9
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LL | #![deny(single_use_lifetimes)]
| ^^^^^^^^^^^^^^^^^^^^
help: elide the single-use lifetime
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LL - a: for<'a> fn(&'a u32),
LL + a: fn(&u32),
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error[E0581]: return type references lifetime `'a`, which is not constrained by the fn input types
--> $DIR/fn-types.rs:12:22
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LL | d: for<'a> fn() -> &'a u32, // OK, used only in return type.
| ^^^^^^^
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0581`.
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