flat assembler 1.56 compile error instructions
setc eax
setc ax
to setc al without Error message.

flat assembler 1.56 compile error instructions
setc esi
setc si
to setc dh without Error message.

And so on...

Fixed.

I'm surpised

From Intel Opcodes and Mnemonics:
SETC - Set if Carry (386+)
Usage: SETC dest
Modifies flags: none
Sets the byte in the operand to 1 if the Carry Flag is set,
otherwise sets the operand to 0.
Clocks Size
Operands 808x 286 386 486 Bytes
reg8 - - 4 3 3

mem8 - - 5 4 3

0F 92 SETC r/m8 Set if carry (CF=1)

Is it possible to write - setc eax ; eax is not r/m8

It is not possible, but before the bug was fixed, it was possible.

it's a good news