by cw@f00f.org:

hg identify: a216dfd16073 tip
6g -V:       6g version weekly.2012-03-13 +360c1d325ed4
OS:          linux amd64


The code below causes an ICE:



package main

import "fmt"

type S struct {
        x int
}

func bar(x interface{}) {}

func main() {
        s1 := S{1}
        s2 := S{1}
        bar(s1 == s2)         // OK                                                                                                                                                                                  
        fmt.Println(s1 == s2) // ERR: internal compiler error: typename ideal bool                                                                                                                                   

}