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The two functional differences are:
- always add the diagnostics string
- check erroneousness in `issueAmbiguousTypeErrorUnlessErroneous`,
before even constructing the error message.
Consider this nugget:
```
- def issueAmbiguousError(pre: Type, sym1: Symbol, sym2: Symbol, err: AbsTypeError) {
- issueCommon(err) { case _ if ambiguousErrors =>
- if (!pre.isErroneous && !sym1.isErroneous && !sym2.isErroneous)
```
I'd like to state for the record that the if-erroneous in the
case of the partial function looked super-dodgy: it meant that,
when `ambiguousErrors`, `issueCommon` would not get to the `else` branches
that buffer or throw, and if the erroneous condition was met,
nothing would be issued/buffered/thrown.
This refactoring checks this condition up front.
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