AssemblyError

Assembly stopped before a valid result could be produced. This is the catch-all code for errors that have not yet been given a narrower category; the diagnostic’s message, source location and expansion notes explain the particular failure.

Start at the named file and line. If the line came from a macro or included file, follow the accompanying notes to its definition and invocation. Check the selected dialect before changing syntax: a directive accepted by one assembler need not mean the same thing in another.

Fix the first reported error and assemble again. Later labels and sizes can depend on that line, so a failed assembly is not a trustworthy partial image. If the same source works in the reference assembler, retain the smallest reproducing source, the dialect/CPU options and both tool versions when reporting the mismatch.

--message-format=json reports the code separately from the human message. Do not parse the message to recover a category; its wording can improve without changing the meaning of this code.