Nathan Shively-Sanders 9a65658b28 Parse *= separately in types (#39457) ...

* Parse *= separately in types

Previously, when the scanner produced `*=` as a single token, the type
parser ran special-case code to produce an "optional all type", which
only makes sense when the `=` really should be attached to the `*`. This
is often not the case.

The correct solution, which I missed when I first wrote this code, is to
have the scanner go back and produce a separate `=` token, which is what
this PR does.

* add test from #38551

* we ❤️ semicolons

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baselines/reference

Parse *= separately in types (#39457)

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cases

Parse *= separately in types (#39457)

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lib

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