type T7 struct {}

func (T7) m1() {}
func ((T7)) m2() {}
func ((*T7)) m3() {}
func (x *(T7),) m4() {}
func (x (*(T7)),) m5() {}
func (x ((*((T7)))),) m6() {}

// Check that methods with parenthesized receiver are actually present (issue #23130).
var (
	_ = T7.m1
	_ = T7.m2
	_ = (*T7).m3
	_ = (*T7).m4
	_ = (*T7).m5
	_ = (*T7).m6

2474          ; disallowed_STD3_mapped ; 0028 0031 0029 #1.1  PARENTHESIZED DIGIT ONE
2475          ; disallowed_STD3_mapped ; 0028 0032 0029 #1.1  PARENTHESIZED DIGIT TWO
2476          ; disallowed_STD3_mapped ; 0028 0033 0029 #1.1  PARENTHESIZED DIGIT THREE
2477          ; disallowed_STD3_mapped ; 0028 0034 0029 #1.1  PARENTHESIZED DIGIT FOUR
2478          ; disallowed_STD3_mapped ; 0028 0035 0029 #1.1  PARENTHESIZED DIGIT FIVE

	// The empty string must be preserved inside parens in order
	// to make submatches work right, so these tests are less
	// interesting than they might otherwise be. String inserts
	// explicit (?:) in place of non-parenthesized empty strings,
	// to make them easier to spot for other parsers.
	{`(a|b|c|)`, `([a-c]|(?:))`},
	{`(a|b|)`, `([ab]|(?:))`},
	{`(|)`, `()`},
	{`a()`, `a()`},
	{`(()|())`, `(()|())`},
	{`(a|)`, `(a|(?:))`},

// component. If the second N is unsigned, a + sign is required between the two components
// as indicated by the ±. If the second N is NaN, only a + sign is accepted.
// The form may be parenthesized and cannot contain any spaces.
// The resulting complex number consists of the two components converted by ParseFloat.
//
// The errors that ParseComplex returns have concrete type [*NumError]
// and include err.Num = s.

	`package p; type _ struct{ ( /* ERROR "cannot parenthesize embedded type" */ int) }`,
	`package p; type _ struct{ ( /* ERROR "cannot parenthesize embedded type" */ []byte) }`,
	`package p; type _ struct{ *( /* ERROR "cannot parenthesize embedded type" */ int) }`,
	`package p; type _ struct{ *( /* ERROR "cannot parenthesize embedded type" */ []byte) }`,

	// go.dev/issue/8656

package or module. Subsequent lines give a path through the import
graph, one package per line. If the package or module is not
referenced from the main module, the stanza will display a single
parenthesized note indicating that fact.

For example:

	$ go mod why golang.org/x/text/language golang.org/x/text/encoding
	# golang.org/x/text/language
	rsc.io/quote
	rsc.io/sampler
	golang.org/x/text/language

		*syntax.AssignStmt, *syntax.CallStmt:
		// no chance

	case *syntax.LabeledStmt:
		return check.isTerminating(s.Stmt, s.Label.Value)

	case *syntax.ExprStmt:
		// calling the predeclared (possibly parenthesized) panic() function is terminating
		if call, ok := syntax.Unparen(s.X).(*syntax.CallExpr); ok && check.isPanic[call] {
			return true
		}

	case *syntax.ReturnStmt:
		return true

	case *syntax.BranchStmt:

		*ast.RangeStmt:
		// no chance

	case *ast.LabeledStmt:
		return check.isTerminating(s.Stmt, s.Label.Name)

	case *ast.ExprStmt:
		// calling the predeclared (possibly parenthesized) panic() function is terminating
		if call, ok := ast.Unparen(s.X).(*ast.CallExpr); ok && check.isPanic[call] {
			return true
		}

	case *ast.ReturnStmt:
		return true

	case *ast.BranchStmt:

			fun = call.Fun
			n++
		}
	}
	if n != 1 {
		t.Errorf("%s: got %d CallExprs; want 1", src0, n)
		return
	}

	// check recorded types for fun and descendents (may be parenthesized)
	for {
		// the recorded type for the built-in must match the wanted signature
		typ := types[fun].Type
		if typ == nil {
			t.Errorf("%s: no type recorded for %s", src0, ExprString(fun))
			return
		}

		Incomplete bool      // true if (source) expressions are missing in the Elts list
	}

	// A ParenExpr node represents a parenthesized expression.
	ParenExpr struct {
		Lparen token.Pos // position of "("
		X      Expr      // parenthesized expression
		Rparen token.Pos // position of ")"
	}

	// A SelectorExpr node represents an expression followed by a selector.
	SelectorExpr struct {