Map domain and range restrictions are over-constrained

overturetool / overture

The Overture Tool

http://overturetool.org

GNU General Public License v3.0

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Map domain and range restrictions are over-constrained #776

Open nickbattle opened 3 years ago

nickbattle commented 3 years ago

The set passed to <:, <-:, :-> and :> operators can be of an arbitrary type. The operator does not have to succeed in limiting the map - it may be that no entries in the set match the map or the set may be empty. Currently the 3.0.3 type checker is over-constraining these set values to match the type of the map that they are operating on. This was fixed in VDMJ at some point, but Overture missed it.

nickbattle commented 3 years ago

Now fixed in ncb/development.