bug212, bug213.

R=ken
http://go/go-review/1026032

src/cmd/gc/print.c

@@ -328,6 +328,13 @@ exprfmt(Fmt *f, Node *n, int prec)
 		}
 		fmtprint(f, ")");
 		break;
+
+	case OMAKEMAP:
+		fmtprint(f, "make(%#T)", n->type);
+		break;
+
+	case OMAPLIT:
+		fmtprint(f, "map literal");
 	}
 
 	if(prec > nprec)

src/cmd/gc/subr.c

@@ -1654,7 +1654,7 @@ iscomposite(Type *t)
 int
 eqtype1(Type *t1, Type *t2, int d, int names)
 {
-	if(d >= 10)
+	if(d >= 20)
 		return 1;
 	if(t1 == t2)
 		return 1;
@@ -1720,14 +1720,19 @@ eqtype1(Type *t1, Type *t2, int d, int names)
 		return 1;
 
 	case TARRAY:
-		if(t1->bound == t2->bound)
-			break;
-		return 0;
+		if(t1->bound != t2->bound)
+			return 0;
+		break;
 
 	case TCHAN:
-		if(t1->chan == t2->chan)
-			break;
-		return 0;
+		if(t1->chan != t2->chan)
+			return 0;
+		break;
+
+	case TMAP:
+		if(!eqtype1(t1->down, t2->down, d+1, names))
+			return 0;
+		break;
 	}
 	return eqtype1(t1->type, t2->type, d+1, names);
 }

src/cmd/gc/swt.c

@@ -313,9 +313,13 @@ casebody(Node *sw, Node *typeswvar)
 
 		// botch - shouldnt fall thru declaration
 		last = stat->end->n;
-		if(last->op == OXFALL)
+		if(last->op == OXFALL) {
+			if(typeswvar) {
+				setlineno(last);
+				yyerror("cannot fallthrough in type switch");
+			}
 			last->op = OFALL;
-		else
+		} else
 			stat = list(stat, br);
 	}
 

src/pkg/debug/dwarf/open.go

@@ -51,7 +51,7 @@ func New(abbrev, aranges, frame, info, line, pubnames, ranges, str []byte) (*Dat
 		ranges: ranges,
 		str: str,
 		abbrevCache: make(map[uint32]abbrevTable),
-		typeCache: make(map[uint32]Type),
+		typeCache: make(map[Offset]Type),
 	};
 
 	// Sniff .debug_info to figure out byte order.

test/golden.out

@@ -201,9 +201,3 @@ throw: interface conversion
 panic PC=xxx
 
 == bugs/
-
-=========== bugs/bug212.go
-BUG: errchk: command succeeded unexpectedly
-
-=========== bugs/bug213.go
-BUG: errchk: command succeeded unexpectedly