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📁 ..
📄 blank.go(203 B)
📄 builtins0.go(23.81 KB)
📄 builtins1.go(5.46 KB)
📄 chans.go(1.66 KB)
📄 compliterals.go(442 B)
📄 const0.go(9.18 KB)
📄 const1.go(8.56 KB)
📄 constdecl.go(3.67 KB)
📄 conversions0.go(1.71 KB)
📄 conversions1.go(5.07 KB)
📄 cycles0.go(2.85 KB)
📄 cycles1.go(781 B)
📄 cycles2.go(1.12 KB)
📄 cycles3.go(675 B)
📄 cycles4.go(2.03 KB)
📄 cycles5.go(2.98 KB)
📄 decls0.go(3.97 KB)
📄 decls1.go(3.6 KB)
📁 decls2
📄 decls3.go(4.24 KB)
📄 decls4.go(3.1 KB)
📄 decls5.go(363 B)
📄 errors.go(2.16 KB)
📄 expr0.go(3.7 KB)
📄 expr1.go(2.61 KB)
📄 expr2.go(4.92 KB)
📄 expr3.go(15.42 KB)
📄 funcinference.go(2.07 KB)
📄 go1_12.go(1.07 KB)
📄 go1_13.go(402 B)
📄 go1_16.go(343 B)
📄 go1_8.go(333 B)
📄 gotos.go(5.77 KB)
📄 importC.go(1.23 KB)
📁 importdecl0
📁 importdecl1
📄 init0.go(1.91 KB)
📄 init1.go(1.46 KB)
📄 init2.go(3.51 KB)
📁 issue25008
📄 issues0.go(11.44 KB)
📄 issues1.go(6.02 KB)
📄 labels.go(3.25 KB)
📄 linalg.go(2.24 KB)
📄 literals.go(2.35 KB)
📄 main0.go(361 B)
📄 main1.go(250 B)
📄 map0.go(2.82 KB)
📄 map1.go(3.4 KB)
📄 methodsets.go(3.44 KB)
📄 shifts.go(12.62 KB)
📄 slices.go(1.51 KB)
📄 stmt0.go(18.68 KB)
📄 stmt1.go(3.31 KB)
📄 typeinference.go(1.38 KB)
📄 typeinst0.go(1.62 KB)
📄 typeinst1.go(5.65 KB)
📄 typeinstcycles.go(384 B)
📄 typeparams.go(15.06 KB)
📄 unions.go(2.15 KB)
📄 vardecl.go(5.47 KB)

Editing: constdecl.go

// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package constdecl

import "math"
import "unsafe"

var v int

// Const decls must be initialized by constants.
const _ = v /* ERROR "not constant" */
const _ = math /* ERROR "not constant" */ .Sin(0)
const _ = int /* ERROR "not an expression" */

func _() {
	const _ = v /* ERROR "not constant" */
	const _ = math /* ERROR "not constant" */ .Sin(0)
	const _ = int /* ERROR "not an expression" */
}

// Identifier and expression arity must match.
const _ /* ERROR "missing init expr for _" */
const _ = 1, 2 /* ERROR "extra init expr 2" */

const _ /* ERROR "missing init expr for _" */ int
const _ int = 1, 2 /* ERROR "extra init expr 2" */

const (
	_ /* ERROR "missing init expr for _" */
	_ = 1, 2 /* ERROR "extra init expr 2" */

_ /* ERROR "missing init expr for _" */ int
	_ int = 1, 2 /* ERROR "extra init expr 2" */
)

const (
	_ = 1
	_
	_, _ /* ERROR "missing init expr for _" */
	_
)

const (
	_, _ = 1, 2
	_, _
	_ /* ERROR "extra init expr at" */
	_, _
	_, _, _ /* ERROR "missing init expr for _" */
	_, _
)

func _() {
	const _ /* ERROR "missing init expr for _" */
	const _ = 1, 2 /* ERROR "extra init expr 2" */

const _ /* ERROR "missing init expr for _" */ int
	const _ int = 1, 2 /* ERROR "extra init expr 2" */

const (
		_ /* ERROR "missing init expr for _" */
		_ = 1, 2 /* ERROR "extra init expr 2" */

_ /* ERROR "missing init expr for _" */ int
		_ int = 1, 2 /* ERROR "extra init expr 2" */
	)

const (
		_ = 1
		_
		_, _ /* ERROR "missing init expr for _" */
		_
	)

const (
		_, _ = 1, 2
		_, _
		_ /* ERROR "extra init expr at" */
		_, _
		_, _, _ /* ERROR "missing init expr for _" */
		_, _
	)
}

// Test case for constant with invalid initialization.
// Caused panic because the constant value was not set up (gri - 7/8/2014).
func _() {
	const (
	    x string = missing /* ERROR "undeclared name" */
	    y = x + ""
	)
}

// Test case for constants depending on function literals (see also #22992).
const A /* ERROR initialization cycle */ = unsafe.Sizeof(func() { _ = A })

func _() {
	// The function literal below must not see a.
	const a = unsafe.Sizeof(func() { _ = a /* ERROR "undeclared name" */ })
	const b = unsafe.Sizeof(func() { _ = a })

// The function literal below must not see x, y, or z.
	const x, y, z = 0, 1, unsafe.Sizeof(func() { _ = x /* ERROR "undeclared name" */ + y /* ERROR "undeclared name" */ + z /* ERROR "undeclared name" */ })
}

// Test cases for errors in inherited constant initialization expressions.
// Errors related to inherited initialization expressions must appear at
// the constant identifier being declared, not at the original expression
// (issues #42991, #42992).
const (
	_ byte = 255 + iota
	/* some gap */
	_ // ERROR overflows
	/* some gap */
	/* some gap */ _ /* ERROR overflows */; _ /* ERROR overflows */
	/* some gap */
	_ = 255 + iota
	_ = byte /* ERROR overflows */ (255) + iota
	_ /* ERROR overflows */
)

// Test cases from issue.
const (
	ok = byte(iota + 253)
	bad
	barn
	bard // ERROR cannot convert
)

const (
	c = len([1 - iota]int{})
	d
	e // ERROR invalid array length
	f // ERROR invalid array length
)

// Test that identifiers in implicit (omitted) RHS
// expressions of constant declarations are resolved
// in the correct context; see issues #49157, #53585.
const X = 2

func _() {
	const (
		A    = iota // 0
		iota = iota // 1
		B           // 1 (iota is declared locally on prev. line)
		C           // 1
	)
	assert(A == 0 && B == 1 && C == 1)

const (
		X = X + X
		Y
		Z = iota
	)
	assert(X == 4 && Y == 8 && Z == 1)
}

// TODO(gri) move extra tests from testdata/const0.src into here

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Editing: constdecl.go

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