var poserPathErr = &fs.PathError{Op: "poser"}

func (p *poser) Error() string     { return p.msg }
func (p *poser) Is(err error) bool { return p.f(err) }
func (p *poser) As(err any) bool {
	switch x := err.(type) {
	case **poser:
		*x = p
	case *errorT:
		*x = errorT{"poser"}
	case **fs.PathError:
		*x = poserPathErr
	default:
		return false
	}
	return true
}

func TestAs(t *testing.T) {
	var errT errorT

func hasDots(call *syntax.CallExpr) bool { return call.HasDots }

// dddErrPos returns the node (poser) for reporting an invalid ... use in a call.
func dddErrPos(call *syntax.CallExpr) *syntax.CallExpr {
	// TODO(gri) should use "..." instead of call position
	return call
}

// argErrPos returns the node (poser) for reporting an invalid argument count.
func argErrPos(call *syntax.CallExpr) *syntax.CallExpr { return call }

	invalidOp  = "invalid operation: "
)

// The poser interface is used to extract the position of type-checker errors.
type poser interface {
	Pos() syntax.Pos
}

func (check *Checker) error(at poser, code Code, msg string) {
	err := check.newError(code)
	err.addf(at, "%s", msg)
	err.report()
}

func (check *Checker) errorf(at poser, code Code, format string, args ...any) {
	err := check.newError(code)

// is allowed to use version v. If the position is unknown, the specified
// module version (Config.GoVersion) is used. If that version is invalid,
// allowVersion returns true.
func (check *Checker) allowVersion(at poser, v goVersion) bool {
	fileVersion := check.conf.GoVersion
	if pos := at.Pos(); pos.IsKnown() {
		fileVersion = check.versions[pos.FileBase()]
	}

	// We need asGoVersion (which calls version.Lang) below

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eri
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## Créer une Issue

Vous pouvez <a href="https://github.com/tiangolo/fastapi/issues/new/choose" class="external-link" target="_blank">créer une Issue</a> dans le dépôt GitHub, par exemple pour :

* Poser une question ou s'informer sur un problème.
* Suggérer une nouvelle fonctionnalité.

**Note** : si vous créez un problème, alors je vais vous demander d'aider aussi les autres. 😉

## Créer une Pull Request

			return
		}
	}
	check.errorf(rhs0, WrongAssignCount, "assignment mismatch: %s but %s", vars, vals)
}

func (check *Checker) returnError(at poser, lhs []*Var, rhs []*operand) {
	l, r := len(lhs), len(rhs)
	qualifier := "not enough"
	if r > l {
		at = rhs[l] // report at first extra value
		qualifier = "too many"
	} else if r > 0 {

// Otherwise, it is a no-op.
func (a *action) describef(pos poser, format string, args ...interface{}) {
	if debug {
		a.desc = &actionDesc{pos, format, args}
	}
}

// An actionDesc provides information on an action.
// For debugging only.
type actionDesc struct {
	pos    poser
	format string
	args   []interface{}
}

// and x.mode is set to invalid.
func (check *Checker) funcInst(T *target, pos syntax.Pos, x *operand, inst *syntax.IndexExpr, infer bool) ([]Type, []syntax.Expr) {
	assert(T != nil || inst != nil)

	var instErrPos poser
	if inst != nil {
		instErrPos = inst.Pos()
		x.expr = inst // if we don't have an index expression, keep the existing expression of x
	} else {
		instErrPos = pos
	}

		renameSelectorExprs(f, "syntax.Name->ast.Ident", "ident.Value->ident.Name", "ast.Pos->token.Pos") // must happen before renaming identifiers
		renameIdents(f, "syntax->ast", "poser->positioner", "nopos->noposn")
	},
	"array.go":          nil,
	"api_predicates.go": nil,
	"basic.go":          nil,
	"builtins.go": func(f *ast.File) {
		renameImportPath(f, `"cmd/compile/internal/syntax"->"go/ast"`)