[ksp2] Error Type in type argument does not have API for simple name

[acejingbo]

In KSP2, if a type argument is error type (in java source file), for example Foo in ArrayList<Foo>, then the foo's KSType and KSTypeReference will appear as (<ERROR TYPE: Foo>..<ERROR TYPE: Foo>?). And there's no public API to retrieve the original simple name "Foo".

I end up have to use regex to extract the word Foo from (<ERROR TYPE: Foo>..<ERROR TYPE: Foo>?)

Repro

Example code in acejingbo@ba967e0

Run ksp1 (:compiler-plugin:test) you will get

Run ksp2 (:kotlin-analysis-api:test) you will get

See

• Type argument was NonExistClass in ksp, but was (<ERROR TYPE: NonExistClass>..<ERROR TYPE: NonExistClass>?) in ksp2
• In ksp2 the argumentType and resolvedArgumentType provide no API that can return its original text NonExistClass
  (ktType have it but it's not public!)

Wishlist

Is it reasonable to request an API that can return error type's simple name / original text?
Or expose the inner KtType so we can retrieve from there?

Thanks!