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* filter.c (regex_from_trie): An empty trie matches nothing,
so we must return the t regex syntax (match nothing), not
nil (match empty string). A hash-based trie matches nothing
if it is empty; but if it has user data, then it matches
the empty string.
* tests/015/trie.tl: Test cases added.
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* filter.c (regex_from_trie): If a hash key maps to a string,
do not treat that as a trie; it is the value for that node.
A value is only a trie if it is a cons or hash. Also, in this
case do not make a compound regex.
* tests/015/trie.tl: Add duplicate of regex test case using
regex from compressed tree.
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* filter.c (regex_from_trie): The code is neglecting to check
whether there is a match of the input *at* the given hash
table, which is true if it has user data. In that case, the
empty regex must be added as a parallel branch.
* tests/015/trie.tl: The first regex test case works now.
The second one is incorrect and is replaced.
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This is not a complete fix yet; the test case still fails.
* filter.c (regex_from_trie): The (or ...) operator in the
regex language is strictly binary. Do not produce a
variable-argument or expression.
* tests/015/trie.tl: New file.
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