reject struct to interface conversion for now

R=ken
OCL=21007
CL=21007

diff --git a/src/cmd/gc/walk.c b/src/cmd/gc/walk.c
index d31b1269a275449058a7b236fc8fb5eea3e42def..c0b78d69df1ad2ffc3c18213f0133b76acb10aa9 100644 (file)
--- a/src/cmd/gc/walk.c
+++ b/src/cmd/gc/walk.c
@@ -2733,7 +2733,12 @@ isandss(Type *lt, Node *r)
                                return I2I;
                        return Inone;
                }
-               if(isnilinter(lt) || ismethod(rt) != T)
+               if(isnilinter(lt)) {
+                       if(!issimple[rt->etype] && !isptr[rt->etype])
+                               yyerror("using %T as interface is unimplemented", rt);
+                       return T2I;
+               }
+               if(ismethod(rt) != T)
                        return T2I;
                return Inone;
        }