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Damian Gryski
2a49216152
Add compiler/testdata/go1.27.go, gated behind Go >= 1.27 (the version
that promoted generic methods out of the GenericMethods experiment),
covering both fixes from the previous two commits:
- genericMethod has a regular method and a generic method (its own
type parameter); boxing it into an interface must only include the
regular method in the runtime method set instead of panicking in
getTypeCodeName.
- onlyGenericMethod's sole method is generic, so its type code must
have hasMethodSet == false and no methodSet field at all, not an
empty one.
Verified this test panics on the pre-fix compiler/interface.go and
passes after it.
25 lines
919 B
Go
25 lines
919 B
Go
package main
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// genericMethod has both a regular method and a "generic method": a method
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// with its own type parameter, independent of any type parameter on the
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// receiver. This is a Go 1.27 feature (see math/rand/v2.Rand.N for a
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// real-world example). Boxing such a value into an interface must not try to
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// encode the generic method's type-parameterized signature into a type code.
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type genericMethod struct{}
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func (t genericMethod) Regular(n int) int { return n }
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func (t genericMethod) GenericParam[X int | int64](n X) X { return n }
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// onlyGenericMethod's only method is generic, so its runtime type must have
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// an empty method set (hasMethodSet must become false, not just numMethods).
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type onlyGenericMethod struct{}
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func (t onlyGenericMethod) GenericParam[X int | int64](n X) X { return n }
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func useGenericMethods() (any, any) {
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var g genericMethod
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var o onlyGenericMethod
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return any(g), any(o)
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}
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