[dev] protoc-gen-go: format interfaces for gofmt 1.9 and 1.10 #486
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Change the pre-gofmt generated code for oneof discriminant interfaces
from:
type T interface { T() }
to:
type T interface {
T()
}
Prior to Go 1.9, gofmt rewrote the single-line form into the multi-line
one. Go 1.10 and later preserve the single-line form for single-method
interfaces. Generating code that is handled identically by both versions
of gofmt avoids spurious diffs with golden test data.
Change-Id: Ibb229827823a50e963bcd1b34e59a286654b415f