fix string_lit test to be more thorough

SVN=121623

test/golden.out

@@ -41,9 +41,6 @@ sieve.go:8: fatal error: walktype: switch 1 unknown op SEND l(8)
 BUG: known to fail incorrectly
 
 =========== ./string_lit.go
-string_lit.go:5: syntax error
-string_lit.go:12: unknown escape sequence: \ 
-BUG: known to fail incorrectly                                                                                    
 
 =========== ./switch.go
 

test/string_lit.go

@@ -6,25 +6,74 @@
 
 package main
 
-func main() {
-  []string(
-    "",
-    " ",
-    "'`",
-    "a",
-    "ä",
-    "本",
-    "\a\b\f\n\r\t\v\\\"",
-    "\000\123\x00\xca\xFE\u0123\ubabe\U0123ABCD\Ucafebabe",
-    
-    ``,
-    ` `,
-    `'"`,
-    `a`,
-    `ä`,
-    `本`,
-    `\a\b\f\n\r\t\v\\\'\"`,
-    `\000\123\x00\xca\xFE\u0123\ubabe\U0123ABCD\Ucafebabe`,
-    `\x\u\U\`
-  );
+var ecode int;
+
+func assert(a, b, c string) {
+	if a != b {
+		ecode = 1;
+		print "FAIL: ", c, ": ", a, "!=", b, "\n";
+		var max int = len(a);
+		if len(b) > max {
+			max = len(b);
+		}
+		for i := 0; i < max; i++ {
+			ac := 0;
+			bc := 0;
+			if i < len(a) {
+				ac = int(a[i]);
+			}
+			if i < len(b) {
+				bc = int(b[i]);
+			}
+			if ac != bc {
+				print "\ta[", i, "] = ", ac, "; b[", i, "] =", bc, "\n";
+			}
+		}
+	}
+}
+
+func main() int {
+	ecode = 0;
+	s :=
+		""
+		" "
+		"'`"
+		"a"
+		"ä"
+		"本"
+		"\a\b\f\n\r\t\v\\\""
+		"\000\123\x00\xca\xFE\u0123\ubabe\U0000babe"
+		
+		``
+		` `
+		`'"`
+		`a`
+		`ä`
+		`本`
+		`\a\b\f\n\r\t\v\\\'`
+		`\000\123\x00\xca\xFE\u0123\ubabe\U0000babe`
+		`\x\u\U\`
+	;
+	assert("", ``, "empty");
+	assert(" ", " ", "blank");
+	assert("\x61", "a", "lowercase a");
+	assert("\x61", `a`, "lowercase a (backquote)");
+	assert("\u00e4", "ä", "a umlaut");
+	assert("\u00e4", `ä`, "a umlaut (backquote)");
+	assert("\u672c", "本", "nihon");
+	assert("\u672c", `本`, "nihon (backquote)");
+	assert("\x07\x08\x0c\x0a\x0d\x09\x0b\x5c\x22",
+	       "\a\b\f\n\r\t\v\\\"",
+	       "backslashes");
+	assert("\\a\\b\\f\\n\\r\\t\\v\\\\\\\"",
+	       `\a\b\f\n\r\t\v\\\"`,
+	       "backslashes (backquote)");
+	assert("\x00\x53\000\xca\376S몾몾",
+	       "\000\123\x00\312\xFE\u0053\ubabe\U0000babe",
+		   "backslashes 2");
+	assert("\\000\\123\\x00\\312\\xFE\\u0123\\ubabe\\U0000babe",
+	       `\000\123\x00\312\xFE\u0123\ubabe\U0000babe`,
+           "backslashes 2 (backquote)");
+	assert("\\x\\u\\U\\", `\x\u\U\`, "backslash 3 (backquote)");
+	return ecode;
 }