FUEL: Fix the fix to multiline string literals font-lock.

misc/fuel/fuel-syntax.el

@@ -94,7 +94,7 @@
   "\\_<-?[0-9]+\\.[0-9]*\\([eE][+-]?[0-9]+\\)?\\_>")
 
 (defconst fuel-syntax--bad-string-regex
-  "\"[^\"]*$")
+  "\"\\([^\"]\\|\\\\\"\\)*\n")
 
 (defconst fuel-syntax--word-definition-regex
   (fuel-syntax--second-word-regex
@@ -226,7 +226,7 @@
     ;; CHARs:
     ("CHAR: \\(.\\)\\( \\|$\\)" (1 "w"))
     ;; Strings
-    ("\\(\"\\)[^\n\r\f]*\\(\"\\)" (1 "\"") (2 "\""))
+    ("\\(\"\\)\\([^\n\r\f\\\"]\\|\\\\\"?\\)*\\(\"\\)" (1 "\"") (3 "\""))
     ;; Let and lambda:
     ("\\_<\\(!(\\) .* \\()\\)" (1 "<") (2 ">"))
     ("\\(\\[\\)\\(let\\|wlet\\|let\\*\\)\\( \\|$\\)" (1 "(]"))