Further fixes to newline escaping

Addresses issue described in https://github.com/fish-shell/fish-shell/issues/347#issuecomment-10650443

tests/test1.in

@@ -24,6 +24,12 @@ bar"
 echo 'foo\
 bar'
 
+for i in \
+    a b c
+    echo $i
+end
+
+
 # Simple alias tests
 
 function foo

tests/test1.out

@@ -10,6 +10,9 @@ foobar
 foobar
 foo\
 bar
+a
+b
+c
 Test 2 pass
 Test  pass
 Test 3 pass