Right now, a target name can contain space, comma, /, etc, so it would be a good idea to limit it to alphanumeric + - and _

For example:

diff --git a/BUILD b/BUILD
index 0ad0a46..c71bab2 100644
--- a/BUILD
+++ b/BUILD
@@ -52,3 +52,6 @@ files(
   name = 'pants_pex',
   source = 'pants.pex',
 )
+
+target(
+  name = '123/456')


$ ./pants list :
//:123/456

We need to improve the comments explaining the main ideas / insights of the solution

As a first effect of #1287, we should react to the reporting of I/O errors with a notification that the service is down. This concerns the rawx, meta0, meta2, meta2 and sqlx service types.

• manage in sqliterepo (meta*, sqlx)
• manage in rawx

Write a class method recursivePrint(int count) of a class Recursion which prints "z y x w "
on the first line, "z y x " on the second line, ..., "z " on the fourth line by recursion if count is 4. If
count is n (n <= 26), n lines should be printed and the first line contains "z y x ...? ", where "?" is the
nth letter starting from "z". Note that there is a space after each letter.
Test it usin