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go/types: fix error message for embedded non-interface types in interfaces

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Fixes #10979.

Change-Id: Iac25645ba8181a56a75ddfcd29ff6d64c15c4f57
Reviewed-on: https://go-review.googlesource.com/10466
Reviewed-by: Alan Donovan <adonovan@google.com>
This commit is contained in:
Robert Griesemer 2015-05-28 11:58:42 -07:00
parent 3ba6387bd0
commit ccc037699e
2 changed files with 30 additions and 12 deletions
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24
src/go/types/testdata/issues.src vendored
View File

@ -71,3 +71,27 @@ func issue9473(a []int, b ...int) {
append_(f0(), f1()... /* ERROR cannot use */ )
append_(f0(), f2()... /* ERROR cannot use */ )
}
// Check that embedding a non-interface type in an interface results in a good error message.
func issue10979() {
type _ interface {
int /* ERROR int is not an interface */
}
type T struct{}
type _ interface {
T /* ERROR T is not an interface */
}
type _ interface {
nosuchtype /* ERROR undeclared name: nosuchtype */
}
type _ interface {
fmt /* ERROR Nosuchtype not declared by package fmt */ .Nosuchtype
}
type _ interface {
nosuchpkg /* ERROR undeclared name: nosuchpkg */ .Nosuchtype
}
type I interface {
I /* ERROR I\.m \(value of type func\(I\)\) is not a type */ .m
m()
}
}

18
src/go/types/typexpr.go
View File

@ -525,20 +525,14 @@ func (check *Checker) interfaceType(iface *Interface, ityp *ast.InterfaceType, d
for _, e := range embedded {
pos := e.Pos()
typ := check.typExpr(e, nil, path)
// Determine underlying embedded (possibly incomplete) type
// by following its forward chain.
named, _ := typ.(*Named)
if named == nil {
if typ != Typ[Invalid] {
check.invalidAST(pos, "%s is not named type", typ)
}
continue
}
// determine underlying (possibly incomplete) type
// by following its forward chain
u := underlying(named)
embed, _ := u.(*Interface)
under := underlying(named)
embed, _ := under.(*Interface)
if embed == nil {
if u != Typ[Invalid] {
check.errorf(pos, "%s is not an interface", named)
if typ != Typ[Invalid] {
check.errorf(pos, "%s is not an interface", typ)
}
continue
}