Set a batch variable (%1 - %n) when TCC is executing a batch file

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TCC  26.02.42 x64   Windows 10 [Version 10.0.18363.900]

In the help for SET it says;
/B    Set a batch variable (%1 - $n). Only valid when TCC is executing a batch file.

So, from a batch file, I did this;
*set /B1=ABC
echo %1
which I thought would assign ABC to the %1 Batch file parameter, but it returned this;
TCC: (Sys) E:\Utils\regenv.btm [1]  The parameter is incorrect.
What is the proper way to use the /B option from a batch file?

May 20, 2008
Syracuse, NY, USA
It doesn't work here.
v:\> type batchvars.btm
*set /B 1=foo
echo %%1 = %1

v:\> batchvars.btm
TCC: (Sys) V:\batchvars.btm [1]  The parameter is incorrect.
%1 =
May 20, 2008
Syracuse, NY, USA
I see. It has to exist in order to be set.

v:\> type batchvars.btm
echo %%1 = %1
*set /B 1=foo
echo %%1 = %1

v:\> batchvars.btm xx
%1 = xx
%1 = foo[/code]
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