gccrs: fix tokenizing utf-8 whitespaces

gcc/rust/ChangeLog:

	* lex/rust-lex.cc (Lexer::build_token):add check for all kinds of whitespaces

gcc/testsuite/ChangeLog:

	* rust/compile/torture/utf8_whitespaces.rs: New test.

Signed-off-by: Raiki Tamura <[email protected]>

Author: tamaroning

gcc/rust/lex/rust-lex.cc

@@ -420,7 +420,10 @@ Lexer::build_token ()
 	{
 	/* ignore whitespace characters for tokens but continue updating
 	 * location */
-	case '\n': // newline
+	case '\n':   // newline
+	case 0x0085: // next line
+	case 0x2028: // line separator
+	case 0x2029: // paragraph separator
 	  current_line++;
 	  current_column = 1;
 	  // tell line_table that new line starts
@@ -432,10 +435,16 @@ Lexer::build_token ()
 	case ' ': // space
 	  current_column++;
 	  continue;
-	case '\t': // tab
+	case '\t': // horizontal tab
 	  // width of a tab is not well-defined, assume 8 spaces
 	  current_column += 8;
 	  continue;
+	case '\v':   // vertical tab
+	case 0x000c: // form feed
+	case 0x200e: // left-to-right mark
+	case 0x200f: // right-to-left mark
+	  // Ignored.
+	  continue;
 
 	// punctuation - actual tokens
 	case '=':

gcc/testsuite/rust/compile/torture/utf8_whitespaces.rs

@@ -0,0 +1,16 @@
+fn main() {
+    // FORM FEED
+    
+    // LINE TABULATION (vt)
+    
+    // NEXT LINE (nel)
+    …
+    // LEFT-TO-RIGHT MARK
+    ‎
+    // RIGHT-TO-LEFT MARK 
+    ‏
+    // LINE SEPARATOR
+    

+    // PARAGRAPH SEPARATOR 
+    

+}