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Allow pat_lits rewrite to map L_unit to wildcard patterns, rather than
introducing eq_unit tests as guards.
Add a fold_function and fold_funcl functions in rewriter.ml that apply
the pattern and expression algebras to top-level functions, which
means that they correctly get applied to top-level function patterns
when they are used. Currently modifying the re-writing passes to do
this introduces some bugs which needs investigated further. The
current situation is that top-level patterns and patterns elsewhere
are often treated differently because rewrite_exp doesn't (and indeed
cannot, due to how the re-writer is structured) rewrite top level
patterns.
Fix pattern completeness check for unit literals
Fix a bug in Sail->ANF transform where blocks were always annotated
with type unit incorrectly. This caused issues in pattern literal
re-writes where the guard was a block returning a boolean. A test case
for this is added as test/c/and_block.sail.
Fix a bug caused by nested polymorphic function calls and matching in
top-level patterns. Test case is test/c/tl_poly_match.sail.
Pass location info through codegen_conversion for better error
reporting
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