Add types.Unalias to types assertions and types switches to get an underlying type instead of types.Alias

[synenka]

Go 1.24's types package changes type representation: types created as aliases would be represented by types.Alias instead of its underlying type as before. This requires updates to any code using go/types. Specifically, types.Unalias(t) may be needed before type assertions/switches to handle aliases.

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[lostluck]

I think the other comments are the main concerns: We don't want to generate code with underlying/aliased types, we want to use the aliased types for naming things.

There's certainly value in the cases where an alias could be made instead of the raw code. The Unalias handling would have been great when this was originally written, and would have lead to a different approach, had it existed pre generics at all.

However, as I said in my other message: There isn't a great deal of value in fixing this code: users should be migrating to the generic register package, vs trying to use this belabored code generator.

cc: @jrmccluskey @damccorm

[lostluck]

Thank you!

[synenka]

Hi, I've just sent a fix for this. But there is another problem too. When I run tests I can see that ` github.com/apache/beam/sdks/v2/go/test/integration/io/mongodbio` fails with "panic: checked path: $XDG_RUNTIME_DIR" and I'm not sure why.

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On Wed, Feb 19, 2025 at 3:26 PM Robert Burke ***@***.***> wrote: ***@***.**** commented on this pull request. ------------------------------ In sdks/go/pkg/beam/util/starcgenx/starcgenx.go <#33868 (comment)>: > if t, ok := t.(*types.Named); ok { - if pkg := t.Obj().Pkg(); pkg != nil { + e.Printf("extractType: adding import path %q for %v\n", pkg.Path(), t) This should be inside the following if block. Pkg isn't defined yet . — Reply to this email directly, view it on GitHub <#33868 (review)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AXKYBXAZJ36LXBHPBAMIY4D2QSIARAVCNFSM6AAAAABWRN622CVHI2DSMVQWIX3LMV43YUDVNRWFEZLROVSXG5CSMV3GSZLXHMZDMMRWHE4DQNBUGQ> . You are receiving this because you authored the thread.Message ID: <apache/beam/pull/33868/review/2626988444 ***@***.***>

[lostluck]

That seems like a flake or local misconfiguration. I wouldn't worry about it.

Some of the tests aren't set up to run standalone with the go tool, but with the Gradle wrapper the repo uses.

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Just need to run go fmt on shimgenx.go and this will be done.

[lostluck]

Sorry i meant starcgenx.go.

[synenka]

fyi: I'll remove the log line that causes this error: "Error: util/starcgenx/starcgenx.go:521:67: types.Rhs requires go1.23 or later (file is go1.22)"

[lostluck]

#34039 fixes the missing edge case here where alias types might not get registered properly, leading to no code generated for them.