Merge branch 'micro' into maint

* micro:
  NEWS: fix typos and grammaros
  NEWS: document fix for bug#14441
  Automake::Rule: consistently prepend underscore to private variables
  Automake::Rule: rename: suffix_rule() -> next_in_suffix_chain()
  Automake::Rule: adjust comments and POD according to previous changes
  Automake::Rule: make private variables lexically scoped
  suffix rules: better distinction between builtin and user-derived
  Automake::Rule: expose suffix rules as a function, not a scalar
  tests: expose automake bug#14441

diff --cc NEWS
Simple merge

diff --cc THANKS
Simple merge

diff --cc bin/automake.in
index 8f3fb48,63d5bdf..24ff2a6
--- 1/bin/automake.in
--- 2/automake.in
+++ b/bin/automake.in
@@@ -5861,10 -5972,10 +5861,10 @@@ sub register_languag
    # Update the pattern of known extensions.
    accept_extensions (@{$lang->extensions});
  
-   # Update the $suffix_rule map.
+   # Update the suffix rules map.
    foreach my $suffix (@{$lang->extensions})
      {
 -      foreach my $dest (&{$lang->output_extensions} ($suffix))
 +      foreach my $dest ($lang->output_extensions->($suffix))
        {
          register_suffix_rule (INTERNAL, $suffix, $dest);
        }

diff --cc t/list-of-tests.mk
Simple merge