Support Go language in 'etags'

* lib-src/etags.c <Ruby_help>: Fix documentation of Ruby tags.
<Go_help>: New help.
<Go_suffixes>: New variable.
(Go_functions): New function.
<lang_names>: Add entry for Go.  (Bug#22370)

* doc/emacs/maintaining.texi (Tag Syntax): Document Go support.
* doc/man/etags.1: Mention Go support.

* etc/NEWS: Mention Go support.

* test/etags/go-src/test.go:
* test/etags/go-src/test1.go: New test files.
* test/etags/Makefile (GOSRC): New variable.
(SRCS): Add $(GOSRC).
* test/etags/ETAGS.good_1:
* test/etags/ETAGS.good_2:
* test/etags/ETAGS.good_3:
* test/etags/ETAGS.good_4:
* test/etags/ETAGS.good_5:
* test/etags/ETAGS.good_6:
* test/etags/CTAGS.good: Adapt to addition of Go tests.

1 files changed, 4 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 78dce166b43..d0415a22f95 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -1834,6 +1834,10 @@ Names of modules, classes, methods, functions, and constants are
 tagged.  Overloaded operators are also tagged.
 
 +++
+*** New language Go
+Names of packages, functions, and types are tagged.
+
++++
 *** Improved support for Lua
 
 Etags now tags functions even if the "function" keyword follows some