goal_eval_unint failure with tuple-typed variables

[brianhuffman]

The following saw-script:

let {{
  foo : ([8],[64]) -> [16] -> ([8],[64])
  foo x y = x
}};

let tac =
  do {
    goal_eval_unint ["foo"];
    z3;
  };

prove tac {{ \x -> foo x zero == x }};

fails with a panic:

[15:50:14.510] Loading file "/Users/huffman/Documents/saw/goal_eval.saw"
[15:50:14.545] You have encountered a bug in Crucible's implementation.
*** Please create an issue at https://github.com/GaloisInc/crucible/issues

%< ---------------------------------------------------
  Revision:  a4c77ca2932b012e130378c1f0f72be0af0bb888
  Branch:    HEAD (uncommited files present)
  Location:  SAWCore.applyExprSymFn
  Message:   Unknown symbolic function.
             *** Name: x_L
CallStack (from HasCallStack):
  panic, called at src/Lang/Crucible/Panic.hs:11:9 in crucible-0.5-7B7TzoUKryl3ikgTNQA4f2:Lang.Crucible.Panic
  panic, called at src/Lang/Crucible/Backend/SAWCore.hs:712:21 in crucible-saw-0.1-5HtkMLBRiPeHJyebZADtzS:Lang.Crucible.Backend.SAWCore
%< ---------------------------------------------------

[brianhuffman]

Fixed in #601, which includes GaloisInc/saw-core-what4@fd1f993 and GaloisInc/saw-core-sbv@414d7b3.