You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: expr.go
    path of file: ./repos/gomacro/fast
    
    the code of the file until where you have to start completion: /*
 * gomacro - A Go interpreter with Lisp-like macros
 *
 * Copyright (C) 2017-2019 Massimiliano Ghilardi
 *
 *     This Source Code Form is subject to the terms of the Mozilla Public
 *     License, v. 2.0. If a copy of the MPL was not distributed with this
 *     file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 *
 * expr.go
 *
 *  Created on Apr 01, 2017
 *      Author Massimiliano Ghilardi
 */

package fast

import (
	"go/ast"
	"go/token"
	r "reflect"

	xr "github.com/cosmos72/gomacro/xreflect"
)

// ExprsMultipleValues either a single expression returning multiple values,
// or multiple expressions each returning a value.
func (c *Comp) ExprsMultipleValues(nodes []ast.Expr, expectedValuesN int) (inits []*Expr) {
	n := len(nodes)
	if n != expectedValuesN {
		if n != 1 {
			c.Errorf("value count mismatch: cannot assign %d values to %d places: %v",
				n, expectedValuesN, nodes)
			return nil
    
func (c *Comp) Expr1OrType(expr ast.Expr) (e *Expr, t xr.Type) {
	node := expr
	for {
		switch n := node.(type) {
		case *ast.StarExpr:
			node = n.X
			continue
		case *ast.ParenExpr:
			node = n.X
			continue
		case *ast.Ident:
			name := n.Name
			for o := c; o != nil; o = o.Outer {
				bind, okb := o.Binds[name]
				var okt bool
				if okb && (GENERICS_V1_CXX() || GENERICS_V2_CTI()) {
					_, okt = bind.Value.(*GenericType) // generic types are stored in Comp.Bind[]
					okb = !okt
				}
				if okb {
					return c.Expr1(expr, nil), nil
				} else if _, ok := o.Types[name]; ok || okt {
					return nil, c.Type(expr)
				}
			}
		case *ast.IndexExpr:
			if GENERICS_V1_CXX() || GENERICS_V2_CTI() {
				if lit, ok := n.Index.(*ast.CompositeLit); ok && lit.Type == nil {
					// foo#[a, b...] can be a generic function or a generic type
					node = n.X
					continue
				}
			}
		}
		break
	}
	panicking := true
	defer func() {
		if panicking {
			recover()
			t = c.Type(expr)
		}
	}()
	e = c.Expr1(expr, nil)
	panicking = false
	return
}