Method singleValue

types/expr.go:1832–1845

singleValue reports an error if x describes a tuple and sets x.mode to invalid.

(x *operand)

// singleValue reports an error if x describes a tuple and sets x.mode to invalid.
func (check *Checker) singleValue(x *operand) {
	if x.mode == value {
		// tuple types are never named - no need for underlying type below
		if t, ok := x.typ.(*Tuple); ok {
			assert(t.Len() != 1)
			if check.conf.CompilerErrorMessages {
				check.errorf(x, "multiple-value %s in single-value context", x)
			} else {
				check.errorf(x, "%d-valued %s where single value is expected", t.Len(), x)
			}
			x.mode = invalid
		}
	}
}

// op2tok translates syntax.Operators into token.Tokens.
var op2tok = [...]token.Token{