cf1ec17360
Deal with case where a certain instantiation of a generic function/method leads to an unsatisfiable type assertion or type case. In that case, the compiler was causing a fatal error while trying to create an impossible itab for the dictionary. To deal with that case, allow ITabLsym() to create a dummy itab even when the concrete type doesn't implement the interface. This dummy itab is analogous to the "negative" itabs created on-the-fly by the runtime. We will use the dummy itab in type asserts and type switches in instantiations that use that dictionary entry. Since the dummy itab can never be used for any real value at runtime (since the concrete type doesn't implement the interface), there will always be a failure for the corresponding type assertion or a non-match for the corresponding type-switch case. Fixes #50002 Change-Id: I1df05b1019533e1fc93dd7ab29f331a74fab9202 Reviewed-on: https://go-review.googlesource.com/c/go/+/369894 Reviewed-by: Keith Randall <khr@golang.org> Trust: Dan Scales <danscales@google.com> Run-TryBot: Dan Scales <danscales@google.com> TryBot-Result: Gopher Robot <gobot@golang.org> |
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