`lda stringlength("?")` errors

[trillllian]

god i hate this parser so much

Errors occurred while assembling.
<input>:2: error: (Einvalid_label_name): Invalid label name.
    in block: [lda stringlength("?")]

i narrowed it down to getlen() calling labelname() on the ?, and apparently tried a fix which didn't work but i don't remember why not

[trillllian]

fixed by math_ast 🥳