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Introduce a mechanism to textually trim highlighted strings, so that we can print out "expected/found" note with shorter output while still keeping the highlighted inner parts.
```
error[E0308]: mismatched types
--> $DIR/long-type-E0308.rs:30:5
|
LL | ) -> <
| ______-
LL | | <
LL | | <T::Wrapper<T> as FooBar>::Assoc as FooBar
LL | | >::Assoc as FooBar
LL | | >::Wrapper<<T::Assoc as FooBar>::Assoc>
| |_______________________________________- expected `<_ as FooBar>::Wrapper<_>` because of return type
...
LL | value...oc())
| ^^^^^...^^^^^ expected `really_really_really_long_module::FooBar::Wrapper`, found `really_really_really_long_module::FooBar::Assoc`
|
= note: expected associated type `<<<<_ as FooBar>::Wrapper<_> as...pper<_>`
found associated type `<<<<_ as FooBar>::Assoc as Fo...pper<_>`
= note: an associated type was expected, but a different one was found
= note: the full name for the type has been written to '$TEST_BUILD_DIR/long-type-E0308.long-type-$LONG_TYPE_HASH.txt'
= note: consider using `--verbose` to print the full type name to the console
```