LaTeX3 errors parsed incorrectly

[Ismo Toijala]

Here is an example (from the log):

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!
! siunitx error: "literal-unit"
!
! Literal units disabled.
!
! See the siunitx documentation for further information.
!
! For immediate help type H <return>.
!...............................................

l.10 \si{m}

|'''''''''''''''''''''''''''''''''''''''''''''''
| You gave the literal input 'm' but literal unit output is disabled.
|...............................................

rubber outputs:

main.tex:10: ..............................................
main.tex:10: leading text: \si{m}

The real error message is not shown in the output.

This happens with any errors produced using LaTeX3 expl3 msg functions (siunitx is a good example).

I am only using rubber-info for parsing the log after compiling with nonstopmode.