structure concatenation

[Stuart Colley <src(at)star.ucl.ac.uk>]

I'm trying to concatenate two structures using: 

plot_params=[TEMPORARY(plot_params), tmp_struct]

but get:

% Conflicting data structures: TMP_STRUCT,concatenation.

But the structures have exactly the same tag names, and the type of data,
INT, FLOAT, etc, is the same for each tag in both structures.  I even put
a STOP statement before the concatenation to double check the structures.

Am I missing something?
cheers,
S


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