fix(rt): recognize closure env refs in tuple-arg setup

Author: Stevengre

kmir/src/kmir/kdist/mir-semantics/kmir.md

@@ -581,16 +581,22 @@ Therefore a heuristics is used here:
                // or the closure ref type pointee is missing from the type table
      andBool isRefType(lookupTy(tyOfLocal({LOCALS[CLOSURE]}:>TypedLocal)))
      andBool isTy(pointeeTy(lookupTy(tyOfLocal({LOCALS[CLOSURE]}:>TypedLocal))))
-     andBool lookupTy({pointeeTy(lookupTy(tyOfLocal({LOCALS[CLOSURE]}:>TypedLocal)))}:>Ty) ==K typeInfoVoidType
+     andBool (
+               lookupTy({pointeeTy(lookupTy(tyOfLocal({LOCALS[CLOSURE]}:>TypedLocal)))}:>Ty) ==K typeInfoVoidType
+               orBool isFunType(lookupTy({pointeeTy(lookupTy(tyOfLocal({LOCALS[CLOSURE]}:>TypedLocal)))}:>Ty))
+             )
     [priority(45), preserves-definedness]
 
   syntax Bool ::= isTupleType ( TypeInfo ) [function, total]
                 | isRefType ( TypeInfo ) [function, total]
+                | isFunType ( TypeInfo ) [function, total]
   // -------------------------------------------------------
   rule isTupleType(typeInfoTupleType(_, _)) => true
   rule isTupleType(    _                  ) => false [owise]
   rule isRefType(typeInfoRefType(_)) => true
   rule isRefType(    _             ) => false [owise]
+  rule isFunType(typeInfoFunType(_)) => true
+  rule isFunType(    _             ) => false [owise]
 
   syntax KItem ::= #setTupleArgs ( Int , Value )
                  | #setTupleArgs ( Int , List )

kmir/src/tests/integration/data/prove-rs/show/closure_access_struct-fail.main.expected

@@ -3,13 +3,15 @@
 │   #execTerminator ( terminator ( ... kind: terminatorKindCall ( ... func: operandC
 │   span: 0
 │
-│  (196 steps)
-└─ 3 (stuck, leaf)
-    #traverseProjection ( toLocal ( 2 ) , Aggregate ( variantIdx ( 0 ) , ListItem (
-    span: 125
-
-
-┌─ 2 (root, leaf, target, terminal)
+│  (313 steps)
+├─ 3 (terminal)
 │   #EndProgram ~> .K
+│   function: main
+│
+┊  constraint: true
+┊  subst: ...
+└─ 2 (leaf, target, terminal)
+    #EndProgram ~> .K
+