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Tej Chajed authored Jul 21, 2020 and Ralf Jung committed Mar 24, 2021

The syntax re-uses the existing support for pure names, namely the % and
%H patterns. Using "[% H]" is like `iDestruct ... as (?) "H"` and using
"[%x H]" (with the string-ident plugin) is like `iDestruct ... as (x)
"H"`.

This changes how these patterns are parsed. Previously, both would have
been handled as conjunctions (using IntoAnd or IntoSep, depending on
whether the hypothesis is persistent or not). This means it was possible
for the user to use "[% H]" to destruct a pure hypothesis ⌜φ ∧ ψ⌝ and
put only the first conjunct in the Gallina context, leaving the other
one in the IPM; such patterns will now break, since iExistDestruct
does not handle this use case.

Tej Chajed authored Mar 23, 2021 and Ralf Jung committed Mar 23, 2021

Fixes #404

* Rename ghost_map_elem_elem_frac_ne → ghost_map_elem_frac_ne,
  ghost_map_elem_elem_ne → ghost_map_elem_ne.
* Make ghost_map_elem_persist work for arbitrary `dfrac`.
* Add ghost_map_insert_persist.

Makes it possible to use several logical steps for one logical steps, in a way which can be controlled by ghost state.