go/test/makemap.go

// errorcheck

// Copyright 2017 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.

// Ensure that typed non-integer, negative and too large
// values are not accepted as size argument in make for
// maps.

package main

type T map[int]int

var sink T

func main() {
	sink = make(T, -1)            // ERROR "negative size argument in make.*|must not be negative"
	sink = make(T, uint64(1<<63)) // ERROR "size argument too large in make.*|overflows int"

	// Test that errors are emitted at call sites, not const declarations
	const x = -1
	sink = make(T, x) // ERROR "negative size argument in make.*|must not be negative"
	const y = uint64(1 << 63)
	sink = make(T, y) // ERROR "size argument too large in make.*|overflows int"

	sink = make(T, 0.5) // ERROR "constant 0.5 truncated to integer|truncated to int"
	sink = make(T, 1.0)
	sink = make(T, float32(1.0)) // ERROR "non-integer size argument in make.*|must be integer"
	sink = make(T, float64(1.0)) // ERROR "non-integer size argument in make.*|must be integer"
	sink = make(T, 1+0i)
	sink = make(T, complex64(1+0i))  // ERROR "non-integer size argument in make.*|must be integer"
	sink = make(T, complex128(1+0i)) // ERROR "non-integer size argument in make.*|must be integer"
}