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cmd/vet: failed import causes spurious printf error #17006

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alandonovan opened this issue Sep 6, 2016 · 3 comments
Closed

cmd/vet: failed import causes spurious printf error #17006

alandonovan opened this issue Sep 6, 2016 · 3 comments
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Go1.8Maybe

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@alandonovan
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$ cat a.go
package main

import "nosuchpkg"

var format = "%s %s"
var _ = nosuchpkg.Sprintf(format, "a", "b")

$ vet ~/a.go
/usr/local/google/home/adonovan/a.go:6: no formatting directive in Sprintf call

The printf check issues a spurious error when type information for an imported printf-like function is not available. Without the function's type signature, the checker heuristically assumes that the first string constant is the format string, such as "a" in the example above.
@quentinmit quentinmit added this to the Go1.8Maybe milestone Sep 6, 2016
@josharian
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cc @valyala

@josharian josharian changed the title vet: failed import causes spurious printf error cmd/vet: failed import causes spurious printf error Sep 7, 2016
@valyala
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valyala commented Sep 10, 2016

Prepared the CL.

@gopherbot
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CL https://golang.org/cl/29014 mentions this issue.

@golang golang locked and limited conversation to collaborators Oct 5, 2017
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@josharian @quentinmit @valyala @alandonovan @gopherbot