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// run
// Copyright 2023 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.
// Smoke test for reverse type inference.
// The type checker has more expansive tests.
package main
func main() {
var f1 func(int) int
f1 = g1
if f1(1) != g1(1) {
panic(1)
}
var f2 func(int) string = g2
if f2(2) != "" {
panic(2)
}
if g3(g1, 3) != g1(3) {
panic(3)
}
if g4(g2, 4) != "" {
panic(4)
}
}
func g1[P any](x P) P { return x }
func g2[P, Q any](x P) Q { var q Q; return q }
func g3(f1 func(int) int, x int) int { return f1(x) }
func g4(f2 func(int) string, x int) string { return f2(x) }