References with names bound by a match term are not shadowed

[developedby]

Reproducing the behavior

Consider this program

x.head = 0
x.tail = 1

main = match x=[1] {
  List/Cons: @x (x x.head x.tail)
  List/Nil: 0
}

Here, x.head and x.tail should refer to the variables bound by the elimination of List/Cons. Instead they resolved as references to the two functions.

We can reproduce this by running the program, which results in λa (a x.head x.tail) instead o λa (a 1 []) which we get by calling x any other name.

This happens because resolve_refs is called before fix_match_terms and so the names bound by each match arm haven't been generated yet.

System Settings

Bend commit 45839a7

Additional context

No response

[developedby]

The same thing happens with the terms that desugar to matches, like fold and open, but not with pattern matching functions, since they hold their variables differently.