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The spec was unclear about whether blank methods should be permitted in interface types. gccgo permits at most one, gc crashes if there are more than one, go/types permits at most one. Discussion: Since method sets of non-interface types never contain methods with blank names (blank methods are never declared), it is impossible to satisfy an interface with a blank method. It is possible to declare variables of assignable interface types (but not necessarily identical types) containing blank methods, and assign those variables to each other, but the values of those variables can only be nil. There appear to be two "reasonable" alternatives: 1) Permit at most one blank method (since method names must be unique), and consider it part of the interface. This is what appears to happen now, with corner-case bugs. Such interfaces can never be implemented. 2) Permit arbitrary many blank methods but ignore them. This appears to be closer to the handling of blank identifiers in declarations. However, an interface type literal is not a declaration (it's a type literal). Also, for struct types, blank identifiers are not ignored; so the analogy with declarations is flawed. Both these alternatives don't seem to add any benefit and are likely (if only slightly) more complicated to explain and implement than disallowing blank methods in interfaces altogether. Fixes #6604. LGTM=r, rsc, iant R=r, rsc, ken, iant CC=golang-codereviews https://golang.org/cl/99410046 |
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