   (format "%s +\\([^ \r\n]+\\)" (regexp-opt prefixes t)))
 
 (defconst fuel-syntax--method-definition-regex
-  "^M: +\\([^ ]+\\) +\\([^ ]+\\)")
+  "^M::? +\\([^ ]+\\) +\\([^ ]+\\)")
 
 (defconst fuel-syntax--integer-regex
   "\\_<-?[0-9]+\\_>")

                                           "C-ENUM" "C-STRUCT" "C-UNION"
                                           "FROM" "FUNCTION:"
                                           "INTERSECTION:"
                                           "M" "MACRO" "MACRO:"
                                           "MEMO" "MEMO:" "METHOD"
                                           "SYNTAX"
                                           "PREDICATE" "PRIMITIVE"

    "HELP:" "HEX:" "HOOK:"
    "IN:" "initial:" "INSTANCE:" "INTERSECTION:"
    "LIBRARY:"
    "M:" "M::" "MACRO:" "MACRO::" "MAIN:" "MATH:"
    "MEMO:" "MEMO:" "METHOD:" "MIXIN:"
    "OCT:"
    "POSTPONE:" "PREDICATE:" "PRIMITIVE:" "PRIVATE>" "PROVIDE:"
    "QUALIFIED-WITH:" "QUALIFIED:"
