Match error messages generated by gccgo:

convlit1.go:6:15: error: composite literal requires array, map, or struct type
convlit1.go:5:16: error: incompatible type for element 0 in composite literal
convlit1.go:10:15: error: incompatible types in binary expression

R=rsc
DELTA=2  (0 added, 0 deleted, 2 changed)
OCL=17506
CL=17509

test/convlit1.go

@@ -6,10 +6,10 @@
 
 package main
 
-var a = []int { "a" };	// ERROR "conver"
+var a = []int { "a" };	// ERROR "conver|incompatible"
 var b = int { 1 };	// ERROR "compos"
 
 
 func main() {
-	if sys.argc < 1 { }	// ERROR "conver"
+	if sys.argc < 1 { }	// ERROR "conver|incompatible"
 }