// run -gcflags=-G=3 // 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. package main import "reflect" func f[T any](i interface{}) { switch x := i.(type) { case T: println("T", x) case int: println("int", x) case int32, int16: println("int32/int16", reflect.ValueOf(x).Int()) case struct{ a, b T }: println("struct{T,T}", x.a, x.b) default: println("other", reflect.ValueOf(x).Int()) } } func main() { f[float64](float64(6)) f[float64](int(7)) f[float64](int32(8)) f[float64](struct{ a, b float64 }{a: 1, b: 2}) f[float64](int8(9)) f[int32](int32(7)) f[int](int32(7)) }