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diff --git a/lib/generate_errors.sh b/lib/generate_errors.sh
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+#!/bin/sh
+
+# Generate the error file with the helper messages. This script is required
+# when the syntax is modified because menhir will change the state number and
+# we need to make it match with the comment in the messages.
+
+menhir --list-errors *.mly --base parser.mly > all_errors
+menhir --merge-errors expression_parser.messages --merge-errors all_errors *.mly --base parser.mly > expression_parser.messages_new