// Copyright 2009 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. // This file contains test cases for short valid and invalid programs. package parser import "testing" var valids = []string{ "package p\n", `package p;`, `package p; import "fmt"; func f() { fmt.Println("Hello, World!") };`, `package p; func f() { if f(T{}) {} };`, `package p; func f() { _ = <-chan int(nil) };`, `package p; func f() { _ = (<-chan int)(nil) };`, `package p; func f() { _ = (<-chan <-chan int)(nil) };`, `package p; func f() { _ = <-chan <-chan <-chan <-chan <-int(nil) };`, `package p; func f(func() func() func());`, `package p; func f(...T);`, `package p; func f(float, ...int);`, `package p; func f(x int, a ...int) { f(0, a...); f(1, a...,) };`, `package p; func f(int,) {};`, `package p; func f(...int,) {};`, `package p; func f(x ...int,) {};`, `package p; type T []int; var a []bool; func f() { if a[T{42}[0]] {} };`, `package p; type T []int; func g(int) bool { return true }; func f() { if g(T{42}[0]) {} };`, `package p; type T []int; func f() { for _ = range []int{T{42}[0]} {} };`, `package p; var a = T{{1, 2}, {3, 4}}`, `package p; func f() { select { case <- c: case c <- d: case c <- <- d: case <-c <- d: } };`, `package p; func f() { select { case x := (<-c): } };`, `package p; func f() { if ; true {} };`, `package p; func f() { switch ; {} };`, `package p; func f() { for _ = range "foo" + "bar" {} };`, `package p; func f() { var s []int; g(s[:], s[i:], s[:j], s[i:j], s[i:j:k], s[:j:k]) };`, `package p; var ( _ = (struct {*T}).m; _ = (interface {T}).m )`, `package p; func ((T),) m() {}`, `package p; func ((*T),) m() {}`, `package p; func (*(T),) m() {}`, `package p; func _(x []int) { for range x {} }`, `package p; func _() { if [T{}.n]int{} {} }`, `package p; func _() { map[int]int{}[0]++; map[int]int{}[0] += 1 }`, `package p; func _(x interface{f()}) { interface{f()}(x).f() }`, `package p; func _(x chan int) { chan int(x) <- 0 }`, `package p; const (x = 0; y; z)`, // go.dev/issue/9639 `package p; var _ = map[P]int{P{}:0, {}:1}`, `package p; var _ = map[*P]int{&P{}:0, {}:1}`, `package p; type T = int`, `package p; type (T = p.T; _ = struct{}; x = *T)`, `package p; type T (*int)`, `package p; type _ struct{ int }`, `package p; type _ struct{ pkg.T }`, `package p; type _ struct{ *pkg.T }`, `package p; var _ = func()T(nil)`, `package p; func _(T (P))`, `package p; func _(T []E)`, `package p; func _(T [P]E)`, `package p; type _ [A+B]struct{}`, `package p; func (R) _()`, `package p; type _ struct{ f [n]E }`, `package p; type _ struct{ f [a+b+c+d]E }`, `package p; type I1 interface{}; type I2 interface{ I1 }`, // generic code `package p; type _ []T[int]`, `package p; type T[P any] struct { P }`, `package p; type T[P comparable] struct { P }`, `package p; type T[P comparable[P]] struct { P }`, `package p; type T[P1, P2 any] struct { P1; f []P2 }`, `package p; func _[T any]()()`, `package p; func _(T (P))`, `package p; func f[A, B any](); func _() { _ = f[int, int] }`, `package p; func _(x T[P1, P2, P3])`, `package p; func _(x p.T[Q])`, `package p; func _(p.T[Q])`, `package p; type _[A interface{},] struct{}`, `package p; type _[A interface{}] struct{}`, `package p; type _[A, B any,] struct{}`, `package p; type _[A, B any] struct{}`, `package p; type _[A any,] struct{}`, `package p; type _[A any]struct{}`, `package p; type _[A any] struct{ A }`, `package p; func _[T any]()`, `package p; func _[T any](x T)`, `package p; func _[T1, T2 any](x T)`, `package p; func _[A, B any](a A) B`, `package p; func _[A, B C](a A) B`, `package p; func _[A, B C[A, B]](a A) B`, `package p; type _[A, B any] interface { _(a A) B }`, `package p; type _[A, B C[A, B]] interface { _(a A) B }`, `package p; func _[T1, T2 interface{}](x T1) T2`, `package p; func _[T1 interface{ m() }, T2, T3 interface{}](x T1, y T3) T2`, `package p; var _ = []T[int]{}`, `package p; var _ = [10]T[int]{}`, `package p; var _ = func()T[int]{}`, `package p; var _ = map[T[int]]T[int]{}`, `package p; var _ = chan T[int](x)`, `package p; func _(_ T[P], T P) T[P]`, `package p; var _ T[chan int]`, `package p; func (_ R[P]) _(x T)`, `package p; func (_ R[ P, Q]) _(x T)`, `package p; func (R[P]) _()`, `package p; func _(T[P])`, `package p; func _(T[P1, P2, P3 ])`, `package p; func _(T[P]) T[P]`, `package p; type _ struct{ T[P]}`, `package p; type _ struct{ T[struct{a, b, c int}] }`, `package p; type _ interface{int|float32; bool; m(); string;}`, `package p; type I1[T any] interface{}; type I2 interface{ I1[int] }`, `package p; type I1[T any] interface{}; type I2[T any] interface{ I1[T] }`, `package p; type _ interface { N[T] }`, `package p; type T[P any] = T0`, } func TestValid(t *testing.T) { for _, src := range valids { checkErrors(t, src, src, DeclarationErrors|AllErrors, false) } } // TestSingle is useful to track down a problem with a single short test program. func TestSingle(t *testing.T) { const src = `package p; var _ = T{}` checkErrors(t, src, src, DeclarationErrors|AllErrors, true) } var invalids = []string{ `foo /* ERROR "expected 'package'" */ !`, `package p; func f() { if { /* ERROR "missing condition" */ } };`, `package p; func f() { if ; /* ERROR "missing condition" */ {} };`, `package p; func f() { if f(); /* ERROR "missing condition" */ {} };`, `package p; func f() { if _ = range /* ERROR "expected operand" */ x; true {} };`, `package p; func f() { switch _ /* ERROR "expected switch expression" */ = range x; true {} };`, `package p; func f() { for _ = range x ; /* ERROR "expected '{'" */ ; {} };`, `package p; func f() { for ; ; _ = range /* ERROR "expected operand" */ x {} };`, `package p; func f() { for ; _ /* ERROR "expected boolean or range expression" */ = range x ; {} };`, `package p; func f() { switch t = /* ERROR "expected ':=', found '='" */ t.(type) {} };`, `package p; func f() { switch t /* ERROR "expected switch expression" */ , t = t.(type) {} };`, `package p; func f() { switch t /* ERROR "expected switch expression" */ = t.(type), t {} };`, `package p; func f() { _ = (<-<- /* ERROR "expected 'chan'" */ chan int)(nil) };`, `package p; func f() { _ = (<-chan<-chan<-chan<-chan<-chan<- /* ERROR "expected channel type" */ int)(nil) };`, `package p; func f() { if x := g(); x /* ERROR "expected boolean expression" */ = 0 {}};`, `package p; func f() { _ = x = /* ERROR "expected '=='" */ 0 {}};`, `package p; func f() { _ = 1 == func()int { var x bool; x = x = /* ERROR "expected '=='" */ true; return x }() };`, `package p; func f() { var s []int; _ = s[] /* ERROR "expected operand" */ };`, `package p; func f() { var s []int; _ = s[i:j: /* ERROR "final index required" */ ] };`, `package p; func f() { var s []int; _ = s[i: /* ERROR "middle index required" */ :k] };`, `package p; func f() { var s []int; _ = s[i: /* ERROR "middle index required" */ :] };`, `package p; func f() { var s []int; _ = s[: /* ERROR "middle index required" */ :] };`, `package p; func f() { var s []int; _ = s[: /* ERROR "middle index required" */ ::] };`, `package p; func f() { var s []int; _ = s[i:j:k: /* ERROR "expected ']'" */ l] };`, `package p; func f() { for x /* ERROR "boolean or range expression" */ = []string {} }`, `package p; func f() { for x /* ERROR "boolean or range expression" */ := []string {} }`, `package p; func f() { for i /* ERROR "boolean or range expression" */ , x = []string {} }`, `package p; func f() { for i /* ERROR "boolean or range expression" */ , x := []string {} }`, `package p; func f() { go f /* ERROR HERE "must be function call" */ }`, `package p; func f() { go ( /* ERROR "must not be parenthesized" */ f()) }`, `package p; func f() { defer func() {} /* ERROR HERE "must be function call" */ }`, `package p; func f() { defer ( /* ERROR "must not be parenthesized" */ f()) }`, `package p; func f() { go func() { func() { f(x func /* ERROR "missing ','" */ (){}) } } }`, `package p; func _() (type /* ERROR "found 'type'" */ T)(T)`, `package p; func (type /* ERROR "found 'type'" */ T)(T) _()`, `package p; type _[A+B, /* ERROR "unexpected comma" */ ] int`, `package p; type _ struct{ [ /* ERROR "expected '}', found '\['" */ ]byte }`, `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 p; func f() (a b string /* ERROR "missing ','" */ , ok bool)`, // go.dev/issue/9639 `package p; var x, y, z; /* ERROR "expected type" */`, // go.dev/issue/12437 `package p; var _ = struct { x int, /* ERROR "expected ';', found ','" */ }{};`, `package p; var _ = struct { x int, /* ERROR "expected ';', found ','" */ y float }{};`, // go.dev/issue/11611 `package p; type _ struct { int, } /* ERROR "expected 'IDENT', found '}'" */ ;`, `package p; type _ struct { int, float } /* ERROR "expected type, found '}'" */ ;`, // go.dev/issue/13475 `package p; func f() { if true {} else ; /* ERROR "expected if statement or block" */ }`, `package p; func f() { if true {} else defer /* ERROR "expected if statement or block" */ f() }`, // generic code `package p; type _[_ any] int; var _ = T[] /* ERROR "expected operand" */ {}`, `package p; var _ func[ /* ERROR "must have no type parameters" */ T any](T)`, `package p; func _[]/* ERROR "empty type parameter list" */()`, `package p; type _[A,] /* ERROR "missing type constraint" */ struct{ A }`, `package p; func _[type /* ERROR "found 'type'" */ P, *Q interface{}]()`, `package p; func (T) _[ /* ERROR "must have no type parameters" */ A, B any](a A) B`, `package p; func (T) _[ /* ERROR "must have no type parameters" */ A, B C](a A) B`, `package p; func (T) _[ /* ERROR "must have no type parameters" */ A, B C[A, B]](a A) B`, `package p; func(*T[e, e /* ERROR "e redeclared" */ ]) _()`, } func TestInvalid(t *testing.T) { for _, src := range invalids { checkErrors(t, src, src, DeclarationErrors|AllErrors, true) } }