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let is_keyword = function
| "and" -> true
| "as" -> true
| "assert" -> true
| "begin" -> true
| "class" -> true
| "constraint" -> true
| "do" -> true
| "done" -> true
| "downto" -> true
| "else" -> true
| "end" -> true
| "exception" -> true
| "external" -> true
| "false" -> true
| "for" -> true
| "fun" -> true
| "function" -> true
| "functor" -> true
| "if" -> true
| "in" -> true
| "include" -> true
| "inherit" -> true
| "initializer" -> true
| "lazy" -> true
| "let" -> true
| "match" -> true
| "method" -> true
| "module" -> true
| "mutable" -> true
| "new" -> true
| "nonrec" -> true
| "object" -> true
| "of" -> true
| "open" -> true
| "or" -> true
| "private" -> true
| "rec" -> true
| "sig" -> true
| "struct" -> true
| "then" -> true
| "to" -> true
| "true" -> true
| "try" -> true
| "type" -> true
| "val" -> true
| "virtual" -> true
| "when" -> true
| "while" -> true
| "with" -> true
| "lor" -> true
| "lxor" -> true
| "mod" -> true
| "land" -> true
| "lsl" -> true
| "lsr" -> true
| "asr" -> true
| _ -> false