Unknown symbol error could be smarter when missing operand

[jeffythedragonslayer]

Here's an enhancement I think would make 65816 easier to learn. I used this tutorial to recreate this:

https://en.wikibooks.org/wiki/Super_NES_Programming/Initialization_Tutorial

Simply add a line like "sep" without any operand. WLA emits this error:

greenspace.asm:18: ERROR: Unknown symbol "sep".

Huh? This is valid mnemonic - WLA does actually understand this symbol - but there is no implied addressing mode for SEP. I think this would be more accurate:

greenspace.asm:18: ERROR: Illegal addressing mode for "sep".

[vhelin]

As a quick 1st stage fix perhaps

greenspace.asm:18: ERROR: Unknown symbol "sep".

could be

greenspace.asm:18: ERROR: Cannot parse "sep". Syntax error?

instead?

[jeffythedragonslayer]

Sure, though nitpick I think the fact that WLA would know there is a newline after it means that it succeeded in parsing the illegal instruction.

[vhelin]

Adding support for more intelligent error report in that case would require additional code to every instruction parser in WLA DX. It wouldn't be difficult to do, but require quite a lot of work. So not a very high priority issue. :)

[jeffythedragonslayer]

I can't just start with the 65816?

[vhelin]

Sure you can, but for the sake of being consistent, in the end all WLA's assmeblers should behave the same way. Anyway, after one assembler supports this then copypasting it to the others shouldn't be a big deal.