FUEL: fix highlighting of strings escaping quote characters

(modify-syntax-entry ?\\ "_" table) was wrong, instead a bigger regexp
is needed.

misc/fuel/factor-mode.el

@@ -183,7 +183,7 @@ these lines in your .emacs:
 ;;; Regexps galore:
 
 ;; Utility regexp used by other regexps to match a Factor symbol name
-(setq-local symbol "\\(\\(?:\\sw\\|\\s_\\|\\s(\\|\\s)\\)+\\)")
+(setq-local symbol "\\(\\(?:\\sw\\|\\s_\\|\\s(\\|\\s)\\|\\s\\\\)+\\)")
 (setq-local ws+ "[ \n\t]+")
 (setq-local symbols-to-semicolon "\\([^;\t]*\\)\\(;\\)")
 
@@ -872,7 +872,6 @@ With prefix, non-existing files will be created."
     (modify-syntax-entry ?# "_" table)
     (modify-syntax-entry ?! "_" table)
     (modify-syntax-entry ?\n ">   " table)
-    (modify-syntax-entry ?\\ "_" table)
     (modify-syntax-entry ?$ "_" table)
     (modify-syntax-entry ?@ "_" table)
     (modify-syntax-entry ?? "_" table)

misc/fuel/strange-syntax.factor

@@ -12,6 +12,10 @@ TUPLE: a-tuple slot1 slot2 { slot3 integer } ;
 
     USING: tools.test ;
 
+
+! ! Strings
+"containing \"escapes" drop
+
 ! ! Symbol names
 
 ! All slashes are symbol constituents.
@@ -19,6 +23,8 @@ TUPLE: a-tuple slot1 slot2 { slot3 integer } ;
 
 : slash\hack ( -- y ) 20 ;
 
+TUPLE: oh\no ;
+
 ! As are quotes
 : don't-do-that ( x -- y ) ;