mbuild gives errors if .mb segment name starts with a number

[Eric Swenson]

If the .mb segment base name is numeric, e.g. "126.mb", it gives the following error:

mbuild

Installation_directory: >udd>sa>ejs>work>tickets>126

           Scanning, with read of any build_script...

mbuild (scan): Do you want to read the 126.mb file?   y

ERROR 04:  Invalid build script statement on LINE 6
SOURCE:   Build_script:             126.mb;

mbuild (read): Improper data in build script file. Parsing build script: >udd>sa>ejs>work>tickets>126>126.mb

mbuild:

[Gary Dixon]

This issue was repaired by a change in mbuild_script_parse_.rd described in the history comment:

  6) change(2022-01-05,GDixon), approve(2022-02-01,MCR10112),
     audit(2022-02-01,Swenson), install(2022-02-01,MR12.8-1022):
      A) mbuild build script file name (and files derived from that name)
         need not follow rules for PL/I program names.  Rename <ename> syntax
         function to <progName>, and create a new <ename> that makes no special
         requirement on 1st letter of name.

[Eric Swenson]

​https://s3.amazonaws.com/eswenson-multics/public/mcrs/MCR10112.pdf

Fixed with MR12.8-1022.