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If the type T inferred for a type parameter P is P itself (or a derived type containing P), a subsequent unification step leads to infinite recursion: at each encounter of P with the already inferred type T (which is or contains P), P stands for that T and the recursive matching process continues with T, which inevitably contains P again and recursion never terminates. This CL introduces a set of masks, one for each type parameter. When a type parameter is encountered for which a type has already been inferred, the type parameter is "masked" for the recursive matching of the inferred type. Masking makes the type parameter "invisible" such that it will be handled like any other type and not unpacked further. Fixes #48619. For #48656. Change-Id: Ic1d938322be51fd44323ea14f925303f58b27c97 Reviewed-on: https://go-review.googlesource.com/c/go/+/352832 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> Reviewed-by: Robert Findley <rfindley@google.com> |
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