cmd/internal/gc: fix vet detected printf problems

Fixes #10805.

Change-Id: Ia77639e606a0c18fc53cba9749d92f325014025f
Reviewed-on: https://go-review.googlesource.com/10040Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>

src/cmd/internal/gc/dcl.go

@@ -183,7 +183,7 @@ func declare(n *Node, ctxt uint8) {
 	}
 
 	if ctxt == PEXTERN && s.Name == "init" {
-		Yyerror("cannot declare init - must be func", s)
+		Yyerror("cannot declare init - must be func")
 	}
 
 	gen := 0

src/cmd/internal/gc/gen.go

@@ -965,7 +965,7 @@ func cgen_callmeth(n *Node, proc int) {
 	l := n.Left
 
 	if l.Op != ODOTMETH {
-		Fatal("cgen_callmeth: not dotmethod: %v")
+		Fatal("cgen_callmeth: not dotmethod: %v", l)
 	}
 
 	n2 := *n

src/cmd/internal/gc/go.y

@@ -21,6 +21,7 @@
 package gc
 
 import (
+	"fmt"
 	"strings"
 )
 %}
@@ -1975,9 +1976,9 @@ hidden_import:
 		importlist = list(importlist, $2);
 
 		if Debug['E'] > 0 {
-			print("import [%q] func %lN \n", importpkg.Path, $2);
+			fmt.Printf("import [%q] func %v \n", importpkg.Path, $2)
 			if Debug['m'] > 2 && $2.Func.Inl != nil {
-				print("inl body:%+H\n", $2.Func.Inl);
+				fmt.Printf("inl body:%v\n", $2.Func.Inl)
 			}
 		}
 	}

src/cmd/internal/gc/typecheck.go

@@ -1303,7 +1303,7 @@ OpSwitch:
 		if l.Op == OTYPE {
 			if n.Isddd || l.Type.Bound == -100 {
 				if l.Type.Broke == 0 {
-					Yyerror("invalid use of ... in type conversion", l)
+					Yyerror("invalid use of ... in type conversion to %v", l.Type)
 				}
 				n.Diag = 1
 			}
@@ -1528,7 +1528,7 @@ OpSwitch:
 		var t *Type
 		switch l.Type.Etype {
 		default:
-			Yyerror("invalid operation: %v (arguments have type %v, expected floating-point)", n, l.Type, r.Type)
+			Yyerror("invalid operation: %v (arguments have type %v, expected floating-point)", n, l.Type)
 			n.Type = nil
 			return
 
@@ -1645,7 +1645,7 @@ OpSwitch:
 		n.Type = t
 		if !Isslice(t) {
 			if Isconst(args.N, CTNIL) {
-				Yyerror("first argument to append must be typed slice; have untyped nil", t)
+				Yyerror("first argument to append must be typed slice; have untyped nil")
 				n.Type = nil
 				return
 			}
@@ -3526,7 +3526,7 @@ func typecheckfunc(n *Node) {
 func stringtoarraylit(np **Node) {
 	n := *np
 	if n.Left.Op != OLITERAL || n.Left.Val.Ctype != CTSTR {
-		Fatal("stringtoarraylit %N", n)
+		Fatal("stringtoarraylit %v", n)
 	}
 
 	s := n.Left.Val.U.Sval