[bug] out of memory when assembling incomplete macro

Code:

rept 1{
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}

Code:

~ fasm test.asm
flat assembler  version 1.73.31  (16384 kilobytes memory)
error: out of memory.

Try more memory.

Code:

~ fasm test.asm -m 19999
flat assembler  version 1.73.31  (19999 kilobytes memory)
test.asm [2]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] rept [1]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] rept [0]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [2]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [5]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [4]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] match [4]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [4]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [3]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] match [3]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [3]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [2]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] match [2]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [2]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [1]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] match [1]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
test.asm [2] irp [1]:
rept 5{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}
error: incomplete macro.

It got there, but needed a lot of space to figure it out.

However changing the code to add a single extra rept

Code:

rept 1{
rept 6{irp x,<0,1,2,3,4>\{match a=,b=,c=,d=,e,x\\{irp y,<5,6>,<8,7>\\\{\\\}\\}\}}

Code:

~ fasm test.asm -m 19999
flat assembler  version 1.73.31  (19999 kilobytes memory)
error: out of memory.

Let's try more memory.

Code:

~ fasm test.asm -m 199999
flat assembler  version 1.73.31  (199999 kilobytes memory)
error: out of memory.

Let's try more memory.

Code:

~ fasm test.asm -m 499999
flat assembler  version 1.73.31  (499999 kilobytes memory)
error: out of memory.

Let's try more memory.

Code:

~ fasm test.asm -m 1499999
flat assembler  version 1.73.31  (1499999 kilobytes memory)
error: out of memory.

It still can't figure it out.

The first rept doesn't have a closing bracket. And there appears to be some sort of exponential expansion of memory usage when a closing curly bracket is missing.