issue #2607, enable '\e' character escape for --standard cc65

test/readme.txt

@@ -12,6 +12,8 @@ compiler is working as expected (when the tests behave as described):
 /val  - The bulk of tests are contained here, individual tests should exit with
         an exit code of EXIT_SUCCESS when they pass, or EXIT_FAILURE on error.
 
+/err  - contains tests that MUST NOT compile
+
 /standard - like the tests in /val, the tests must exit with EXIT_SUCCESS on
         success. Unlike the tests in /val these are not compiled for every
         combination of optimizer options, but instead always with -Osir and then
@@ -19,6 +21,10 @@ compiler is working as expected (when the tests behave as described):
         to check for regressions in standard conformance of the compiler and the
         library.
 
+/standard_err - like the tests in /err, these tests MUST NOT compile, and like
+        the tests in /standard, these are compiled -Osir and then for each
+        supported C-Standard.
+
 /ref  - These tests produce output that must be compared with reference output.
         Normally the reference output is produced by compiling the program on the
         host (using gcc mostly) and then running them on the host. Tests should
@@ -43,8 +49,6 @@ compiler is working as expected (when the tests behave as described):
         only ever use this as a last resort when something can not be tested by
         other means.
 
-/err  - contains tests that MUST NOT compile
-
 
 /todo and /misc generally contain the tests that fail because of known bugs: