cuando se usa para /f - "fue inesperado en este momento"

I have the following code in a batch file named test.bat:

SET TEMP_PATH=%1%
for /f "tokens=1,2 delims=:" %%a in {%TEMP_PATH%"} do set PATH=%%a &set REVISION=%%b

when calling in cmd test.bat somelongstring:123456

Yo obtengo:

{somelongstring:123456"} do set PATH=%a &set REVISION=%b was unexpected at this time.

Can anyone tell me why I am getting this error? Thanks in advance!