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Kim Nguyễn authored
Partial fix for issue #20. In the Value.t type, the Concat _ value and the Pair value must have the same underlying representation (since their tag is mutated). This actually also corrects a bug: Concat _ nodes acts as constructor (like pairs, xml, records, …) and should also be decorated with a sigma. Adding a sigma component to Concat make the segfault disapear. However, for the moment substitutions in Concat are never used.
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