Very rare failure to expand Foreach-Variable

[Matthew Newton]

On Wed, 2019-02-20 at 15:46 +0000, Graham Clinch wrote:
> So I want to investigate why lib/value.c:value_data_from_str() is
> very occasionally returning -1, but I'm hitting a wall as DEBUG
> statements added to lib/value.c don't seem to cause any visible
> output - is there a way to debug messages from inside the library?

printf()...?

https://rr-project.org/ can be very useful if you're comfortable using
gdb.

-- 
Matthew