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go/types: change Interface.Embedded to panic instead of returning nil for non-defined types #46423

mdempsky opened this issue May 27, 2021 · 0 comments


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@mdempsky mdempsky commented May 27, 2021

Last night I ran into an issue where I'd called Embedded(i) instead of EmbeddedType(i), and it took me a little while to realize the mistake. The issue instead manifested as nil-pointer panic elsewhere from trying to use the Type((*Named)(nil)) value I had inadvertently constructed. I think the mistake would have been easier and quicker to identify if Embedded(i) had simply panicked instead.

I think this is relevant to Go 1.18 because the introduction of generics and union types will probably increase the need for using EmbeddedType instead of Embedded. (Today, EmbeddedType is only needed when a type alias is used to embed an anonymous interface.)

/cc @griesemer @findleyr

@mdempsky mdempsky added this to the Go1.18 milestone May 27, 2021
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