Now works with Futhark HEAD.

That these things need changing is arguably a Futhark defect, but it
will be a little while before they can be fixed.

src/compiler/codegen/register.fut

@@ -84,13 +84,13 @@ let lifetime_analyze_valid [n] (instrs: [n]Instr) (symbol_registers: []SymbolDat
 
         let new_lifetime_mask = lifetime_mask & PRESERVED_REGISTER_MASK
         let spilled_register_mask = lifetime_mask & !PRESERVED_REGISTER_MASK
-        let spilled_registers = iota 64i64 |> map (\i -> 
+        let spilled_registers = tabulate 64 (\i ->
                 if spilled_register_mask & (1 << u64.i64 i) != 0 then
                     i
                 else
                     -1
             )
-        let new_register_state = iota 64i64 |> map (\i ->
+        let new_register_state = tabulate 64 (\i ->
                 if new_lifetime_mask & (1 << u64.i64 i) != 0 then
                     register_state[i]
                 else

src/compiler/passes/check_return_paths.fut

@@ -15,7 +15,7 @@ local type bool_expr_node = (i32, i32, bool_expr_node_type)
 local let iter [n] (expr: [n]bool_expr_node): [n]bool_expr_node =
     let is_value_known ptr = expr[ptr].2 == #true || expr[ptr].2 == #false
     let value ptr = expr[ptr].2 == #true
-    let f (left, right, nty) =
+    let f (left, right, nty : bool_expr_node_type) =
         -- If this node already has a concrete value, then do nothing, as we are done with this node.
         if nty == #true || nty == #false then
             (left, right, nty)
@@ -90,4 +90,4 @@ let check_return_paths [n] (node_types: [n]production.t) (parents: [n]i32) (prev
     -- holds whether the program is correct.
     |> (.[0])
     |> (.2)
-    |> (== #true)
+    |> (== (#true : bool_expr_node_type))