[782f5528e0, using a self-compiled, static version of Guile 2.2.7]
While working on some LilyPond Scheme code I made a typo in file
`define-markup-commands.scm`. While executing `lilypond -V` (after
`make install`) to process my `.ly` file I get the following
backtrace.
```
19 (ly:book-process #<Book> #< Output_def> #< Output_def> #)
18 (ly:spacing-spanner::set-springs #<Grob SpacingSpanner >)
17 (ly:separation-item::calc-skylines #<Grob NonMusicalPap…>)
16 (ly:hara-kiri-group-spanner::pure-height #<Grob Vertic…> …)
15 (ly:axis-group-interface::adjacent-pure-heights #<Grob …>)
14 (ly:axis-group-interface::pure-height #<Grob BassFigur…> …)
13 (ly:axis-group-interface::pure-height #<Grob BassFigur…> …)
12 (ly:axis-group-interface::adjacent-pure-heights #<Grob …>)
11 (ly:grob::stencil-height #<Grob BassFigure >)
10 (ly:text-interface::print #<Grob BassFigure >)
9 (ly:text-interface::interpret-markup #< Output_def> (…) #)
In ice-9/eval.scm:
298:42 8 (_ #(#(#<directory (lily) 1900780>) #< Output_def> (…) …))
In unknown file:
7 (ly:text-interface::interpret-markup #< Output_def> (…) #)
In ice-9/eval.scm:
293:34 6 (_ #(#(#<directory (lily) 1900780>) #< Output_def> (…) …))
In unknown file:
5 (ly:text-interface::interpret-markup #< Output_def> (…) #)
In ice-9/eval.scm:
293:34 4 (_ #(#(#(#(#<directory (lily) 1900780>) #< Out…> …) …) …))
159:9 3 (_ #(#(#(#(#<directory (lily) 1900780>) #< Out…> …) …) …))
263:9 2 (_ #(#(#(#(#<directory (lily) 1900780>) #< Out…> …) …) …))
223:20 1 (proc #(#(#(#(#<directory (lily) 1900780>) #< …> …) …) …))
In unknown file:
0 (%resolve-variable (7 . arg) #<directory (lily) 1900780>)
```
IMHO, this is completely useless. There is not a single hint to the
location of the error – why does Guile treat
`define-markup-commands.scm` as an 'unknown file'?
What am I missing?
Werner
