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[dev.typeparams] cmd/compile/internal/types2: implement close(ch) where ch is of type parameter type
Change-Id: I45189468553e83390fd2640b5708c60a7852fbb5 Reviewed-on: https://go-review.googlesource.com/c/go/+/333713 Trust: Robert Griesemer <gri@golang.org> Run-TryBot: Robert Griesemer <gri@golang.org> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Robert Findley <rfindley@google.com>
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@ -212,19 +212,23 @@ func (check *Checker) builtin(x *operand, call *syntax.CallExpr, id builtinId) (
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case _Close:
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case _Close:
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// close(c)
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// close(c)
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c := asChan(x.typ)
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if !underIs(x.typ, func(u Type) bool {
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if c == nil {
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uch, _ := u.(*Chan)
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check.errorf(x, invalidArg+"%s is not a channel", x)
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if uch == nil {
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check.errorf(x, invalidOp+"cannot close non-channel %s", x)
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return false
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}
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if uch.dir == RecvOnly {
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check.errorf(x, invalidOp+"cannot close receive-only channel %s", x)
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return false
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}
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return true
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}) {
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return
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return
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}
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}
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if c.dir == RecvOnly {
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check.errorf(x, invalidArg+"%s must not be a receive-only channel", x)
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return
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}
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x.mode = novalue
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x.mode = novalue
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if check.Types != nil {
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if check.Types != nil {
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check.recordBuiltinType(call.Fun, makeSig(nil, c))
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check.recordBuiltinType(call.Fun, makeSig(nil, x.typ))
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}
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}
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case _Complex:
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case _Complex:
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@ -6,6 +6,45 @@
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package builtins
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package builtins
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// close
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type C0 interface{ int }
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type C1 interface{ chan int }
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type C2 interface{ chan int | <-chan int }
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type C3 interface{ chan int | chan float32 }
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type C4 interface{ chan int | chan<- int }
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type C5[T any] interface{ ~chan T | chan<- T }
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func _[T any](ch T) {
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close(ch /* ERROR cannot close non-channel */)
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}
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func _[T C0](ch T) {
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close(ch /* ERROR cannot close non-channel */)
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}
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func _[T C1](ch T) {
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close(ch)
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}
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func _[T C2](ch T) {
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close(ch /* ERROR cannot close receive-only channel */)
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}
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func _[T C3](ch T) {
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close(ch)
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}
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func _[T C4](ch T) {
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close(ch)
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}
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func _[T C5[X], X any](ch T) {
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close(ch)
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}
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// make
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type Bmc interface {
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type Bmc interface {
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~map[rune]string | ~chan int
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~map[rune]string | ~chan int
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}
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}
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@ -144,7 +144,7 @@ func close1() {
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var r <-chan int
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var r <-chan int
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close() // ERROR not enough arguments
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close() // ERROR not enough arguments
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close(1, 2) // ERROR too many arguments
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close(1, 2) // ERROR too many arguments
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close(42 /* ERROR not a channel */)
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close(42 /* ERROR cannot close non-channel */)
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close(r /* ERROR receive-only channel */)
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close(r /* ERROR receive-only channel */)
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close(c)
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close(c)
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_ = close /* ERROR used as value */ (c)
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_ = close /* ERROR used as value */ (c)
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@ -105,8 +105,6 @@ func asPointer(t Type) *Pointer {
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return op
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return op
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}
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}
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// asTuple is not needed - not provided
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func asSignature(t Type) *Signature {
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func asSignature(t Type) *Signature {
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op, _ := optype(t).(*Signature)
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op, _ := optype(t).(*Signature)
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return op
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return op
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@ -117,11 +115,6 @@ func asMap(t Type) *Map {
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return op
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return op
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}
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}
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func asChan(t Type) *Chan {
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op, _ := optype(t).(*Chan)
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return op
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}
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// If the argument to asInterface, asNamed, or asTypeParam is of the respective type
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// If the argument to asInterface, asNamed, or asTypeParam is of the respective type
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// (possibly after expanding an instance type), these methods return that type.
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// (possibly after expanding an instance type), these methods return that type.
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// Otherwise the result is nil.
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// Otherwise the result is nil.
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@ -66,5 +66,5 @@ func main() {
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close(c)
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close(c)
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close(cs)
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close(cs)
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close(cr) // ERROR "receive"
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close(cr) // ERROR "receive"
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close(n) // ERROR "invalid operation.*non-chan type|must be channel|not a channel"
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close(n) // ERROR "invalid operation.*non-chan type|must be channel|non-channel"
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}
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}
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