* The "op <infix-op>" syntax for infix operators has been replaced by "(<infix-op>)". If <infix-op> begins or ends with a "*", there needs to be a space between the "*" and the corresponding parenthesis. INCOMPATIBILITY. There is an Isabelle tool "update_op" that converts theory and ML files to the new syntax. Because it is based on regular expression matching, the result may need a bit of manual postprocessing. Invoking "isabelle update_op" converts all files in the current directory (recursively). In case you want to exclude conversion of ML files (because the tool frequently also converts ML's "op" syntax), use option "-m".
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