codeStream (#calc etc.) creates a local sub-dictionary in which to expand the
code so variable lookup needs to be checked with respect to the context
dictionary rather than with respect to the code sub-dictionary. With this
change the following test/dictionary/testCalc #calc example now works:
a 1.1;
d
{
b 4.8;
}
// Access to higher-level sub-entries using the "../" operators, e.g.
f
{
g #calc "$a / $../d/b";
}
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