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go/types: interface implementation error should give a missing method #10260

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slimsag opened this issue Mar 26, 2015 · 2 comments
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go/types: interface implementation error should give a missing method #10260

slimsag opened this issue Mar 26, 2015 · 2 comments
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Go1.6

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@slimsag
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slimsag commented Mar 26, 2015

Consider this very simple play.golang.org program.

Running this program using the current Go compiler produces some very helpful output:

/tmp/sandbox112601999/main.go:11: cannot use S literal (type *S) as type X in assignment:
    *S does not implement X (missing foo method)

However the same program checked via golang.org/x/tools/go/types.Check produces a much less helpful error:

test.go:12:17: cannot assign &(S literal) (value of type *S) to x (variable of type X)

Note the lacking specifics of *S does not implement X (missing foo method) in the above error.
@slimsag slimsag mentioned this issue Mar 26, 2015
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@rsc
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rsc commented Apr 10, 2015

This isn't API so it can be done after 1.5. Feel free to change the milestone if you want to fix for 1.5 anyway.

@rsc rsc changed the title x/tools/go/types: Interface implementation errors are not descriptive. go/types: interface implementation error should give a missing method Apr 10, 2015
@rsc rsc added this to the Unplanned milestone Apr 10, 2015
@griesemer griesemer modified the milestones: Go1.6, Unplanned Jul 23, 2015
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CL https://golang.org/cl/14644 mentions this issue.

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