func checkTypesExpectation(e *expectation, pts pointer.PointsToSet, typ types.Type) bool {
var expected typeutil.Map
var surplus typeutil.Map
exact := true
for _, g := range e.types {
if g == types.Typ[types.Invalid] {
exact = false
continue
}
expected.Set(g, struct{}{})
}
if !pointer.CanHaveDynamicTypes(typ) {
e.errorf("@types expectation requires an interface- or reflect.Value-typed operand, got %s", typ)
return false
}
// Find the set of types that the probe's
// argument (x in print(x)) may contain.
for _, T := range pts.DynamicTypes().Keys() {
if expected.At(T) != nil {
expected.Delete(T)
} else if exact {
surplus.Set(T, struct{}{})
}
}
// Report set difference:
ok := true
if expected.Len() > 0 {
ok = false
e.errorf("interface cannot contain these types: %s", expected.KeysString())
}
if surplus.Len() > 0 {
ok = false
e.errorf("interface may additionally contain these types: %s", surplus.KeysString())
}
return ok
}
