func assignable(t, u types.Type) bool {
if t == nil || u == nil {
return false
}
if t, ok := t.(*types.Basic); ok && t.Info&types.IsUntyped != 0 {
// TODO: consider representability of const values
switch u := underlying(u).(type) {
case *types.Interface:
return u.Empty()
case *types.Basic:
int := t.Info&types.IsInteger != 0
float := t.Info&types.IsFloat != 0
complex := t.Info&types.IsComplex != 0
switch {
case u.Info&types.IsBoolean != 0:
return t.Info&types.IsBoolean != 0
case u.Info&types.IsInteger != 0:
return int
case u.Info&types.IsFloat != 0:
return int || float
case u.Info&types.IsComplex != 0:
return int || float || complex
case u.Info&types.IsString != 0:
return t.Info&types.IsString != 0
}
}
return false
}
return types.IsAssignableTo(t, u)
}
