Use array for tokenToText (#2292)

Author: jakebailey

internal/scanner/scanner.go

@@ -2064,14 +2064,13 @@ func isInUnicodeRanges(cp rune, ranges []rune) bool {
 	return false
 }
 
-var tokenToText map[ast.Kind]string
-
-func init() {
-	tokenToText = make(map[ast.Kind]string, len(textToToken))
-	for text, key := range textToToken {
-		tokenToText[key] = text
+var tokenToText = func() [ast.KindCount]string {
+	var result [ast.KindCount]string
+	for text, kind := range textToToken {
+		result[kind] = text
 	}
-}
+	return result
+}()
 
 func TokenToString(token ast.Kind) string {
 	return tokenToText[token]