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error[E0308]: mismatched types
--> $DIR/option_mut_coerce_shared.rs:5:12
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LL | method(a);
| ------ ^ types differ in mutability
| |
| arguments to this function are incorrect
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= note: expected enum `Option<&()>`
found enum `Option<&mut ()>`
note: function defined here
--> $DIR/option_mut_coerce_shared.rs:1:4
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LL | fn method(a: Option<&()>) {}
| ^^^^^^ --------------
help: try using `.as_deref()` to convert `Option<&mut ()>` to `Option<&()>`
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LL | method(a.as_deref());
| +++++++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.
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