Method WrapError

context.go:622–632

(msg string, val Value)

}

func (c *Context) WrapError(msg string, val Value) Value {
	recType := c.MustLookupTypeRecord([]Field{
		{"message", TypeString, false},
		{"on", val.Type(), false},
	})
	errType := c.LookupTypeError(recType)
	var b scode.Builder
	b.Append(EncodeString(msg))
	b.Append(val.Bytes())
	return NewValue(errType, b.Bytes())
}

func (c *Context) Nullable(typ Type) *TypeUnion {
	var types []Type