What exactly are these inputs?

[mainrs]

customasm/examples/nes/cpu6502.asm

Lines 98 to 107 in 5de7a21

	eor #{imm: i8 } => 0x49 @ imm
	eor <{zaddr: u8 } => 0x45 @ zaddr
	eor <{zaddr: u8 }, x => 0x55 @ zaddr
	eor {zaddr: u8 } => 0x45 @ zaddr
	eor {zaddr: u8 }, x => 0x55 @ zaddr
	eor {addr: u16} => 0x4d @ le(addr)
	eor {addr: u16}, x => 0x5d @ le(addr)
	eor {addr: u16}, y => 0x59 @ le(addr)
	eor ({zaddr: u8 }, x) => 0x41 @ zaddr
	eor ({zaddr: u8 }), y => 0x51 @ zaddr

I cannot figure out what <{...} and #{...} do. Maybe I am missing it but they do not seem to be documented

[hlorenzi]

Those are just generic tokens -- everything outside of { } is. We could have chosen to use any other kind of punctuation there.

As for what they mean in the context of 6502 assembly, # marks an immediate-mode argument, and < is seen on some assembly flavors to mark exclusive zero-page addressing. (To be fair, in those flavors, < might actually just be an operator that takes the lowest 8 bits of a value, akin to `8)