fix fib example

Author: MESYETI

examples/fib.cal

@@ -1,10 +1,7 @@
 include "cores/select.cal"
 include "std/io.cal"
 
-func fib begin
-	let cell n
-	-> n
-
+func fib cell n -> cell res begin
 	if n 1 <= then
 		n return
 	else

source/backends/lua.d

@@ -879,7 +879,9 @@ class BackendLua : CompilerBackend {
 			output ~= format("func__%s()\n", node.func.Sanitise());
 		}
 
-		output ~= "dspBackup = mem[vsp]\n";
+		output ~= "dspBackup = mem[vsp]\n"; // TODO:
+		// this is TERRIBLE
+		// if you try/catch a function with a try/catch inside of it then it all breaks
 		output ~= "vsp = vsp + 1\n";
 
 		++ blockCounter;