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Clarify E0507 to note Fn/FnMut relationship to borrowing #64330

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Sep 10, 2019
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Clarify E0507 to note Fn/FnMut relationship to borrowing #64330

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9 changes: 8 additions & 1 deletion src/librustc_mir/error_codes.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1646,7 +1646,14 @@ fn print_fancy_ref(fancy_ref: &FancyNum){
"##,

E0507: r##"
You tried to move out of a value which was borrowed. Erroneous code example:
You tried to move out of a value which was borrowed.

This can also happen when using a type implementing `Fn` or `FnMut`, as neither
allows moving out of them (they usually represent closures which can be called
more than once). Much of the text following applies equally well to non-`FnOnce`
closure bodies.

Erroneous code example:

```compile_fail,E0507
use std::cell::RefCell;
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