match_bug.lean:3:6: error: invalid pattern, must be an application, constant, variable, type ascription, aliasing pattern or inaccessible term
match_bug.lean:3:12: error: invalid 'match' expression, ':=' expected
match_bug.lean:2:0: error: equation compiler failed (use 'set_option trace.eqn_compiler.elim_match true' for additional details)
