It looks like this software breaks compiler error messages.<p>One of the great features of Knuth and Levy&#x27;s CWEB is that errors are reported in terms of locations in the literate source.  This feature, which works by way of line pragmas, is essential for proper debugger support and, in my opinion, sanity while coding larger projects.<p>If it is missing, it is often better to skip the &quot;tangle&quot; step entirely and have the literate source map directly to the program source line for line.  Trying to &quot;pattern-match&quot; the compiler errors against tags in the source file is a painful waste of time.  The 1-1 mapping is quite practical for more functional languages if one writes code in a style more like SICP than the TeX sources.