Port while test to littlecheck

And we're gonna add more loop stuff, so port it to a file called "loop.fish"

tests/checks/loops.fish

@@ -1,4 +1,4 @@
-# vim: set ft=fish:
+#RUN: %fish %s
 
 function never_runs
 	while false
@@ -17,16 +17,17 @@ function runs_once
 	end
 end
 
-# this should return 1
+# this should return 0
 never_runs; echo "Empty Loop in Function: $status"
+#CHECK: Empty Loop in Function: 0
 
 # this should return 0
 runs_once; echo "Runs Once: $status"
+#CHECK: Runs Once: 0
 
 # this should return 2
 early_return; echo "Early Return: $status"
-
-logmsg Loops exit status handling
+#CHECK: Early Return: 2
 
 function set_status ; return $argv[1]; end
 
@@ -41,6 +42,7 @@ while begin
   end
   true
 end
+#CHECK: Condition Status: 36
 
 # The condition status IS visible in the loop body.
 set_status 55
@@ -48,6 +50,7 @@ while true
   echo "Body Status: $status"
   break
 end
+#CHECK: Body Status: 0
 
 # The status of the last command is visible in the loop condition
 set_status 13
@@ -58,6 +61,8 @@ while begin
   end
   set_status 5
 end
+#CHECK: Condition 2 Status: 13
+#CHECK: Condition 2 Status: 5
 
 # The status of the last command is visible outside the loop
 set rem 5 7 11
@@ -66,8 +71,10 @@ while [ (count $rem) -gt 0 ]
   set rem $rem[2..-1]
 end
 echo "Loop Exit Status: $status"
+#CHECK: Loop Exit Status: 11
 
 # Empty loops succeed.
 false
 while false; end
 echo "Empty Loop Status: $status"
+#CHECK: Empty Loop Status: 0

tests/while.err

@@ -1,3 +0,0 @@
-
-####################
-# Loops exit status handling

tests/while.out

@@ -1,12 +0,0 @@
-Empty Loop in Function: 0
-Runs Once: 0
-Early Return: 2
-
-####################
-# Loops exit status handling
-Condition Status: 36
-Body Status: 0
-Condition 2 Status: 13
-Condition 2 Status: 5
-Loop Exit Status: 11
-Empty Loop Status: 0