1299 - stop using [] in any vector

Useful check:

  $ grep "[^ '\"]\[[^\"]" *.cc \
    |perl -pwe 's/\Wargv\[|\WTests\[|\Wframe\[|\WMemory\[|\WName\[|\WSurrounding_space\[|\WRecipe\[|\WType\[|\WRecipe_number\[|\WType_number\[|\WBefore_fragments\[|\WAfter_fragments\[//g' \
    |perl -pwe 's/\Wargv\[|\WTests\[|\Wframe\[|\WMemory\[|\WName\[|\WSurrounding_space\[|\WRecipe\[|\WType\[|\WRecipe_number\[|\WType_number\[|\WBefore_fragments\[|\WAfter_fragments\[//g' \
    |grep '[^ ]\['

1 files changed, 3 insertions, 3 deletions

diff --git a/013literal_string.cc b/013literal_string.cc
index 57ac8c3a..9e492fbb 100644
--- a/013literal_string.cc
+++ b/013literal_string.cc
@@ -48,9 +48,9 @@ string slurp_quoted(istream& in) {
 }
 
 :(after "reagent::reagent(string s)")
-//?   cout << s[0] << '\n'; //? 1
-  if (s[0] == '[') {
-    assert(s[s.size()-1] == ']');
+//?   cout << s.at(0) << '\n'; //? 1
+  if (s.at(0) == '[') {
+    assert(*s.rbegin() == ']');
     // delete [] delimiters
     s.erase(0, 1);
     s.erase(s.size()-1, s.size());