Gecko [ 167.86.127.34 ]

Name	Size	Permission
blank.src	203 B	-rw-r--r--
builtins.src	23.77 KB	-rw-r--r--
const0.src	8.32 KB	-rw-r--r--
const1.src	8.04 KB	-rw-r--r--
constdecl.src	3.02 KB	-rw-r--r--
conversions.src	1.71 KB	-rw-r--r--
conversions2.src	5.07 KB	-rw-r--r--
cycles.src	2.79 KB	-rw-r--r--
cycles1.src	781 B	-rw-r--r--
cycles2.src	1.21 KB	-rw-r--r--
cycles3.src	675 B	-rw-r--r--
cycles4.src	1.76 KB	-rw-r--r--
cycles5.src	2.91 KB	-rw-r--r--
decls0.src	3.91 KB	-rw-r--r--
decls1.src	3.57 KB	-rw-r--r--
decls2a.src	3.11 KB	-rw-r--r--
decls2b.src	1.87 KB	-rw-r--r--
decls3.src	4.17 KB	-rw-r--r--
decls4.src	2.99 KB	-rw-r--r--
decls5.src	363 B	-rw-r--r--
errors.src	1.9 KB	-rw-r--r--
expr0.src	3.39 KB	-rw-r--r--
expr1.src	2.57 KB	-rw-r--r--
expr2.src	4.63 KB	-rw-r--r--
expr3.src	14.87 KB	-rw-r--r--
gotos.src	5.77 KB	-rw-r--r--
importC.src	1.21 KB	-rw-r--r--
importdecl0a.src	1.24 KB	-rw-r--r--
importdecl0b.src	1000 B	-rw-r--r--
importdecl1a.src	521 B	-rw-r--r--
importdecl1b.src	260 B	-rw-r--r--
init0.src	1.91 KB	-rw-r--r--
init1.src	1.46 KB	-rw-r--r--
init2.src	3.51 KB	-rw-r--r--
issue23203a.src	306 B	-rw-r--r--
issue23203b.src	306 B	-rw-r--r--
issue25008a.src	260 B	-rw-r--r--
issue25008b.src	198 B	-rw-r--r--
issue26390.src	241 B	-rw-r--r--
issue28251.src	1.23 KB	-rw-r--r--
issue6977.src	2.33 KB	-rw-r--r--
issues.src	9.83 KB	-rw-r--r--
labels.src	3.25 KB	-rw-r--r--
literals.src	2.35 KB	-rw-r--r--
methodsets.src	3.16 KB	-rw-r--r--
shifts.src	12.02 KB	-rw-r--r--
stmt0.src	17.79 KB	-rw-r--r--
stmt1.src	3.31 KB	-rw-r--r--
vardecl.src	5.27 KB	-rw-r--r--

Code Editor : vardecl.src

// 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 vardecl

// Prerequisites.
import "math"
func f() {}
func g() (x, y int) { return }
var m map[string]int

// Var decls must have a type or an initializer.
var _ int
var _, _ int

// The first error message is produced by the parser.
// In a real-world scenario, the type-checker would not be run
// in this case and the 2nd error message would not appear.
var _ /* ERROR "missing variable type" */ /* ERROR "missing type or init expr" */
var _ /* ERROR "missing variable type" */ /* ERROR "missing type or init expr" */, _
var _ /* ERROR "missing variable type" */ /* ERROR "missing type or init expr" */, _, _

// The initializer must be an expression.
var _ = int /* ERROR "not an expression" */
var _ = f /* ERROR "used as value" */ ()

// Identifier and expression arity must match.
var _, _ = 1, 2
var _ = 1, 2 /* ERROR "extra init expr 2" */
var _, _ = 1 /* ERROR "cannot initialize [0-9]+ variables with [0-9]+ values" */
var _, _, _ /* ERROR "missing init expr for _" */ = 1, 2

var _ = g /* ERROR "2-valued g" */ ()
var _, _ = g()
var _, _, _ = g /* ERROR "cannot initialize [0-9]+ variables with [0-9]+ values" */ ()

var _ = m["foo"]
var _, _ = m["foo"]
var _, _, _ = m  /* ERROR "cannot initialize [0-9]+ variables with [0-9]+ values" */ ["foo"]

var _, _ int = 1, 2
var _ int = 1, 2 /* ERROR "extra init expr 2" */
var _, _ int = 1 /* ERROR "cannot initialize [0-9]+ variables with [0-9]+ values" */
var _, _, _ /* ERROR "missing init expr for _" */ int = 1, 2

var (
	_, _ = 1, 2
	_ = 1, 2 /* ERROR "extra init expr 2" */
	_, _ = 1 /* ERROR "cannot initialize [0-9]+ variables with [0-9]+ values" */
	_, _, _ /* ERROR "missing init expr for _" */ = 1, 2

_ = g /* ERROR "2-valued g" */ ()
	_, _ = g()
	_, _, _ = g /* ERROR "cannot initialize [0-9]+ variables with [0-9]+ values" */ ()

_ = m["foo"]
	_, _ = m["foo"]
	_, _, _ = m /* ERROR "cannot initialize [0-9]+ variables with [0-9]+ values" */ ["foo"]

_, _ int = 1, 2
	_ int = 1, 2 /* ERROR "extra init expr 2" */
	_, _ int = 1 /* ERROR "cannot initialize [0-9]+ variables with [0-9]+ values" */
	_, _, _ /* ERROR "missing init expr for _" */ int = 1, 2
)

// Variables declared in function bodies must be 'used'.
type T struct{}
func (r T) _(a, b, c int) (u, v, w int) {
	var x1 /* ERROR "declared but not used" */ int
	var x2 /* ERROR "declared but not used" */ int
	x1 = 1
	(x2) = 2

y1 /* ERROR "declared but not used" */ := 1
	y2 /* ERROR "declared but not used" */ := 2
	y1 = 1
	(y1) = 2

{
		var x1 /* ERROR "declared but not used" */ int
		var x2 /* ERROR "declared but not used" */ int
		x1 = 1
		(x2) = 2

y1 /* ERROR "declared but not used" */ := 1
		y2 /* ERROR "declared but not used" */ := 2
		y1 = 1
		(y1) = 2
	}

if x /* ERROR "declared but not used" */ := 0; a < b {}

switch x /* ERROR "declared but not used" */, y := 0, 1; a {
	case 0:
		_ = y
	case 1:
		x /* ERROR "declared but not used" */ := 0
	}

var t interface{}
	switch t /* ERROR "declared but not used" */ := t.(type) {}

switch t /* ERROR "declared but not used" */ := t.(type) {
	case int:
	}

switch t /* ERROR "declared but not used" */ := t.(type) {
	case int:
	case float32, complex64:
		t = nil
	}

switch t := t.(type) {
	case int:
	case float32, complex64:
		_ = t
	}

switch t := t.(type) {
	case int:
	case float32:
	case string:
		_ = func() string {
			return t
		}
	}

switch t := t; t /* ERROR "declared but not used" */ := t.(type) {}

var z1 /* ERROR "declared but not used" */ int
	var z2 int
	_ = func(a, b, c int) (u, v, w int) {
		z1 = a
		(z1) = b
		a = z2
		return
	}

var s []int
	var i /* ERROR "declared but not used" */ , j int
	for i, j = range s {
		_ = j
	}

for i, j /* ERROR "declared but not used" */ := range s {
		_ = func() int {
			return i
		}
	}
	return
}

// Unused variables in function literals must lead to only one error (issue #22524).
func _() {
	_ = func() {
		var x /* ERROR declared but not used */ int
	}
}

// Invalid (unused) expressions must not lead to spurious "declared but not used errors"
func _() {
	var a, b, c int
	var x, y int
	x, y = a /* ERROR cannot assign [0-9]+ values to [0-9]+ variables */ , b, c
	_ = x
	_ = y
}

func _() {
	var x int
	return x /* ERROR no result values expected */
	return math /* ERROR no result values expected */ .Sin(0)
}

func _() int {
	var x, y int
	return /* ERROR wrong number of return values */ x, y
}

// Short variable declarations must declare at least one new non-blank variable.
func _() {
	_ := /* ERROR no new variables */ 0
	_, a := 0, 1
	_, a := /* ERROR no new variables */ 0, 1
	_, a, b := 0, 1, 2
	_, _, _ := /* ERROR no new variables */ 0, 1, 2

_ = a
	_ = b
}

// Test case for variables depending on function literals (see also #22992).
var A /* ERROR initialization cycle */ = func() int { return A }()

func _() {
	// The function literal below must not see a.
	var a = func() int { return a /* ERROR "undeclared name" */ }()
	var _ = func() int { return a }()

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

// TODO(gri) consolidate other var decl checks in this file

${this.title}

Code Editor : vardecl.src