[Bug go/65272] New: switch on type of interface failing

[JamesMikeDuPont at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65272

            Bug ID: 65272
           Summary: switch on type of interface failing
           Product: gcc
           Version: 4.9.2
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: go
          Assignee: ian at airs dot com
          Reporter: JamesMikeDuPont at googlemail dot com
                CC: cmang at google dot com

package test;

func clr(q interface{}) {
    switch x := q.(type) {
    case *x:
        return
    }

occurs in : https://github.com/cznic/ql/blob/master/btree.go