{ "do_not_set_opts": [ "prefix" ], "stdout": [ { "comment": "literal 'some/path/notabs' appears in output, irrespective of os.path.sep, as that's the prefix", "line": "test cases/failing/39 prefix absolute/meson.build:1:0: ERROR: prefix value 'some/path/notabs' must be an absolute path" } ] }