// funcInst type-checks a function instantiation inst and returns the result in x.
// The operand x must be the evaluation of inst.X and its type must be a signature.
func (check *Checker) funcInst(x *operand, ix *typeparams.IndexExpr) {
+ if !check.allowVersion(check.pkg, 1, 18) {
+ check.softErrorf(inNode(ix.Orig, ix.Lbrack), _Todo, "function instantiation requires go1.18 or later")
+ }
+
targs := check.typeList(ix.Indices)
if targs == nil {
x.mode = invalid
// infer type arguments and instantiate signature if necessary
if sig.TParams().Len() > 0 {
+ if !check.allowVersion(check.pkg, 1, 18) {
+ switch call.Fun.(type) {
+ case *ast.IndexExpr, *ast.MultiIndexExpr:
+ ix := typeparams.UnpackIndexExpr(call.Fun)
+ check.softErrorf(inNode(call.Fun, ix.Lbrack), _Todo, "function instantiation requires go1.18 or later")
+ default:
+ check.softErrorf(inNode(call, call.Lparen), _Todo, "implicit function instantiation requires go1.18 or later")
+ }
+ }
// TODO(gri) provide position information for targs so we can feed
// it to the instantiate call for better error reporting
targs := check.infer(call, sig.TParams().list(), targs, sigParams, args, true)
check.initVars(lhs, []ast.Expr{init}, token.NoPos)
}
+// isImportedConstraint reports whether typ is an imported type constraint.
+func (check *Checker) isImportedConstraint(typ Type) bool {
+ named, _ := typ.(*Named)
+ if named == nil || named.obj.pkg == check.pkg || named.obj.pkg == nil {
+ return false
+ }
+ u, _ := named.under().(*Interface)
+ return u != nil && u.IsConstraint()
+}
+
func (check *Checker) typeDecl(obj *TypeName, tdecl *ast.TypeSpec, def *Named) {
assert(obj.typ == nil)
+ var rhs Type
check.later(func() {
check.validType(obj.typ, nil)
+ // If typ is local, an error was already reported where typ is specified/defined.
+ if check.isImportedConstraint(rhs) && !check.allowVersion(check.pkg, 1, 18) {
+ check.errorf(tdecl.Type, _Todo, "using type constraint %s requires go1.18 or later", rhs)
+ }
})
alias := tdecl.Assign.IsValid()
}
obj.typ = Typ[Invalid]
- obj.typ = check.anyType(tdecl.Type)
+ rhs = check.anyType(tdecl.Type)
+ obj.typ = rhs
return
}
}
// determine underlying type of named
- named.fromRHS = check.definedType(tdecl.Type, named)
- assert(named.fromRHS != nil)
+ rhs = check.definedType(tdecl.Type, named)
+ assert(rhs != nil)
+ named.fromRHS = rhs
// The underlying type of named may be itself a named type that is
// incomplete:
check.declarePkgObj(name, obj, di)
}
case typeDecl:
+ if d.spec.TParams.NumFields() != 0 && !check.allowVersion(pkg, 1, 18) {
+ check.softErrorf(d.spec.TParams.List[0], _Todo, "type parameters require go1.18 or later")
+ }
obj := NewTypeName(d.spec.Name.Pos(), pkg, d.spec.Name.Name, nil)
check.declarePkgObj(d.spec.Name, obj, &declInfo{file: fileScope, tdecl: d.spec})
case funcDecl:
- info := &declInfo{file: fileScope, fdecl: d.decl}
name := d.decl.Name.Name
obj := NewFunc(d.decl.Name.Pos(), pkg, name, nil)
+ hasTParamError := false // avoid duplicate type parameter errors
if d.decl.Recv.NumFields() == 0 {
// regular function
if d.decl.Recv != nil {
if name == "main" {
code = _InvalidMainDecl
}
- if tparams := typeparams.Get(d.decl.Type); tparams != nil {
- check.softErrorf(tparams, code, "func %s must have no type parameters", name)
+ if d.decl.Type.TParams.NumFields() != 0 {
+ check.softErrorf(d.decl.Type.TParams.List[0], code, "func %s must have no type parameters", name)
+ hasTParamError = true
}
if t := d.decl.Type; t.Params.NumFields() != 0 || t.Results != nil {
// TODO(rFindley) Should this be a hard error?
}
check.recordDef(d.decl.Name, obj)
}
+ if d.decl.Type.TParams.NumFields() != 0 && !check.allowVersion(pkg, 1, 18) && !hasTParamError {
+ check.softErrorf(d.decl.Type.TParams.List[0], _Todo, "type parameters require go1.18 or later")
+ }
+ info := &declInfo{file: fileScope, fdecl: d.decl}
// Methods are not package-level objects but we still track them in the
// object map so that we can handle them like regular functions (if the
// receiver is invalid); also we need their fdecl info when associating
// subst returns the type typ with its type parameters tpars replaced by the
// corresponding type arguments targs, recursively. subst is pure in the sense
// that it doesn't modify the incoming type. If a substitution took place, the
-// result type is different from from the incoming type.
+// result type is different from the incoming type.
//
// If the given typMap is non-nil, it is used in lieu of check.typMap.
func (check *Checker) subst(pos token.Pos, typ Type, smap substMap, typMap map[string]*Named) Type {
m1(I5)
}
I6 interface {
- S0 /* ERROR "not an interface" */
+ S0 /* ERROR "non-interface type S0" */
}
I7 interface {
I1
// Check that embedding a non-interface type in an interface results in a good error message.
func issue10979() {
type _ interface {
- int /* ERROR int is not an interface */
+ int /* ERROR non-interface type int */
}
type T struct{}
type _ interface {
- T /* ERROR T is not an interface */
+ T /* ERROR non-interface type T */
}
type _ interface {
nosuchtype /* ERROR undeclared name: nosuchtype */
}
type issue25301c interface {
- notE // ERROR struct\{\} is not an interface
+ notE // ERROR non-interface type struct\{\}
}
type notE = struct{}
package main
-func main[ /* ERROR "func main must have no type parameters" */ T any]() {}
+func main[T /* ERROR "func main must have no type parameters" */ any]() {}
// init functions cannot have type parameters
func init() {}
-func init[/* ERROR func init must have no type parameters */ _ any]() {}
-func init[/* ERROR func init must have no type parameters */ P any]() {}
+func init[_ /* ERROR func init must have no type parameters */ any]() {}
+func init[P /* ERROR func init must have no type parameters */ any]() {}
type T struct {}
--- /dev/null
+// Copyright 2021 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.
+
+// Parser accepts type parameters but the type checker
+// needs to report any operations that are not permitted
+// before Go 1.18.
+
+package go1_17
+
+type T[P /* ERROR type parameters require go1\.18 or later */ any] struct{}
+
+// for init (and main, but we're not in package main) we should only get one error
+func init[P /* ERROR func init must have no type parameters */ any]() {}
+func main[P /* ERROR type parameters require go1\.18 or later */ any]() {}
+
+func f[P /* ERROR type parameters require go1\.18 or later */ any](x P) {
+ var _ T[ /* ERROR type instantiation requires go1\.18 or later */ int]
+ var _ (T[ /* ERROR type instantiation requires go1\.18 or later */ int])
+ _ = T[ /* ERROR type instantiation requires go1\.18 or later */ int]{}
+ _ = T[ /* ERROR type instantiation requires go1\.18 or later */ int](struct{}{})
+}
+
+func (T[ /* ERROR type instantiation requires go1\.18 or later */ P]) g(x int) {
+ f[ /* ERROR function instantiation requires go1\.18 or later */ int](0) // explicit instantiation
+ (f[ /* ERROR function instantiation requires go1\.18 or later */ int])(0) // parentheses (different code path)
+ f( /* ERROR implicit function instantiation requires go1\.18 or later */ x) // implicit instantiation
+}
+
+type C1 interface {
+ comparable // ERROR undeclared name: comparable \(requires version go1\.18 or later\)
+}
+
+type C2 interface {
+ comparable // ERROR undeclared name: comparable \(requires version go1\.18 or later\)
+ int // ERROR embedding non-interface type int requires go1\.18 or later
+ ~ /* ERROR embedding interface element ~int requires go1\.18 or later */ int
+ int /* ERROR embedding interface element int\|~string requires go1\.18 or later */ | ~string
+}
+
+type _ interface {
+ // errors for these were reported with their declaration
+ C1
+ C2
+}
+
+type (
+ _ comparable // ERROR undeclared name: comparable \(requires version go1\.18 or later\)
+ // errors for these were reported with their declaration
+ _ C1
+ _ C2
+
+ _ = comparable // ERROR undeclared name: comparable \(requires version go1\.18 or later\)
+ // errors for these were reported with their declaration
+ _ = C1
+ _ = C2
+)
+
+// TODO(gri) need test cases for imported constraint types (see also issue #47967)
switch u := under(typ).(type) {
case *Interface:
tset := computeInterfaceTypeSet(check, pos, u)
+ // If typ is local, an error was already reported where typ is specified/defined.
+ if check != nil && check.isImportedConstraint(typ) && !check.allowVersion(check.pkg, 1, 18) {
+ check.errorf(atPos(pos), _Todo, "embedding constraint interface %s requires go1.18 or later", typ)
+ continue
+ }
if tset.comparable {
ityp.tset.comparable = true
}
}
terms = tset.terms
case *Union:
+ if check != nil && !check.allowVersion(check.pkg, 1, 18) {
+ check.errorf(atPos(pos), _Todo, "embedding interface element %s requires go1.18 or later", u)
+ continue
+ }
tset := computeUnionTypeSet(check, pos, u)
if tset == &invalidTypeSet {
continue // ignore invalid unions
continue
}
if check != nil && !check.allowVersion(check.pkg, 1, 18) {
- check.errorf(atPos(pos), _InvalidIfaceEmbed, "%s is not an interface", typ)
+ check.errorf(atPos(pos), _InvalidIfaceEmbed, "embedding non-interface type %s requires go1.18 or later", typ)
continue
}
terms = termlist{{false, typ}}
}
return
case universeAny, universeComparable:
+ // complain if necessary but keep going
if !check.allowVersion(check.pkg, 1, 18) {
- check.errorf(e, _UndeclaredName, "undeclared name: %s (requires version go1.18 or later)", e.Name)
- return
- }
- // If we allow "any" for general use, this if-statement can be removed (issue #33232).
- if obj == universeAny {
- check.error(e, _Todo, "cannot use any outside constraint position")
- return
+ check.softErrorf(e, _UndeclaredName, "undeclared name: %s (requires version go1.18 or later)", e.Name)
+ } else if obj == universeAny {
+ // If we allow "any" for general use, this if-statement can be removed (issue #33232).
+ check.softErrorf(e, _Todo, "cannot use any outside constraint position")
}
}
check.recordUse(e, obj)
case *ast.IndexExpr, *ast.MultiIndexExpr:
ix := typeparams.UnpackIndexExpr(e)
+ if !check.allowVersion(check.pkg, 1, 18) {
+ check.softErrorf(inNode(e, ix.Lbrack), _Todo, "type instantiation requires go1.18 or later")
+ }
// TODO(rfindley): type instantiation should require go1.18
return check.instantiatedType(ix.X, ix.Indices, def)