Reclaim unused bits in ${^WARNING_BITS}

`no warnings 'experimental::foo';` is effectively a no-op
if the `foo` feature is not experimental any more.

So, stop reserving bits in `${^WARNING_BITS}` for them,
and silently do nothing when they are enabled or disabled
via `use warnings` or `no warnings`.

Warnings turned into no-op in this commit:
* experimental::alpha_assertions
* experimental::bitwise
* experimental::isa
* experimental::lexical_subs
* experimental::postderef
* experimental::script_run
* experimental::signatures

1 files changed, 24 insertions, 41 deletions

diff --git a/warnings.h b/warnings.h
index 0db66144b7..dd9866ba09 100644
--- a/warnings.h
+++ b/warnings.h
@@ -90,61 +90,51 @@
 /* Warnings Categories added in Perl 5.017 */
 
 #define WARN_EXPERIMENTAL		 51
-#define WARN_EXPERIMENTAL__LEXICAL_SUBS	 52
-#define WARN_EXPERIMENTAL__REGEX_SETS	 53
-#define WARN_EXPERIMENTAL__SMARTMATCH	 54
+#define WARN_EXPERIMENTAL__REGEX_SETS	 52
+#define WARN_EXPERIMENTAL__SMARTMATCH	 53
 
 /* Warnings Categories added in Perl 5.019 */
 
-#define WARN_EXPERIMENTAL__POSTDEREF	 55
-#define WARN_EXPERIMENTAL__SIGNATURES	 56
-#define WARN_SYSCALLS			 57
+#define WARN_SYSCALLS			 54
 
 /* Warnings Categories added in Perl 5.021 */
 
-#define WARN_EXPERIMENTAL__BITWISE	 58
-#define WARN_EXPERIMENTAL__CONST_ATTR	 59
-#define WARN_EXPERIMENTAL__RE_STRICT	 60
-#define WARN_EXPERIMENTAL__REFALIASING	 61
-#define WARN_LOCALE			 62
-#define WARN_MISSING			 63
-#define WARN_REDUNDANT			 64
+#define WARN_EXPERIMENTAL__CONST_ATTR	 55
+#define WARN_EXPERIMENTAL__RE_STRICT	 56
+#define WARN_EXPERIMENTAL__REFALIASING	 57
+#define WARN_LOCALE			 58
+#define WARN_MISSING			 59
+#define WARN_REDUNDANT			 60
 
 /* Warnings Categories added in Perl 5.025 */
 
-#define WARN_EXPERIMENTAL__DECLARED_REFS 65
+#define WARN_EXPERIMENTAL__DECLARED_REFS 61
 
 /* Warnings Categories added in Perl 5.027 */
 
-#define WARN_EXPERIMENTAL__ALPHA_ASSERTIONS 66
-#define WARN_EXPERIMENTAL__SCRIPT_RUN	 67
-#define WARN_SHADOW			 68
+#define WARN_SHADOW			 62
 
 /* Warnings Categories added in Perl 5.029 */
 
-#define WARN_EXPERIMENTAL__PRIVATE_USE	 69
-#define WARN_EXPERIMENTAL__UNIPROP_WILDCARDS 70
-#define WARN_EXPERIMENTAL__VLB		 71
-
-/* Warnings Categories added in Perl 5.031 */
-
-#define WARN_EXPERIMENTAL__ISA		 72
+#define WARN_EXPERIMENTAL__PRIVATE_USE	 63
+#define WARN_EXPERIMENTAL__UNIPROP_WILDCARDS 64
+#define WARN_EXPERIMENTAL__VLB		 65
 
 /* Warnings Categories added in Perl 5.033 */
 
-#define WARN_EXPERIMENTAL__TRY		 73
+#define WARN_EXPERIMENTAL__TRY		 66
 
 /* Warnings Categories added in Perl 5.035 */
 
-#define WARN_EXPERIMENTAL__ARGS_ARRAY_WITH_SIGNATURES 74
-#define WARN_EXPERIMENTAL__BUILTIN	 75
-#define WARN_EXPERIMENTAL__DEFER	 76
-#define WARN_EXPERIMENTAL__EXTRA_PAIRED_DELIMITERS 77
-#define WARN_EXPERIMENTAL__FOR_LIST	 78
-#define WARN_SCALAR			 79
-#define WARNsize			 20
-#define WARN_ALLstring			 "\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125"
-#define WARN_NONEstring			 "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
+#define WARN_EXPERIMENTAL__ARGS_ARRAY_WITH_SIGNATURES 67
+#define WARN_EXPERIMENTAL__BUILTIN	 68
+#define WARN_EXPERIMENTAL__DEFER	 69
+#define WARN_EXPERIMENTAL__EXTRA_PAIRED_DELIMITERS 70
+#define WARN_EXPERIMENTAL__FOR_LIST	 71
+#define WARN_SCALAR			 72
+#define WARNsize			 19
+#define WARN_ALLstring			 "\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125\125"
+#define WARN_NONEstring			 "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"
 
 #define isLEXWARN_on \
         cBOOL(PL_curcop && PL_curcop->cop_warnings != pWARN_STD)
@@ -303,13 +293,9 @@ category parameters passed.
 =for apidoc Amnh||WARN_NONCHAR
 =for apidoc Amnh||WARN_SURROGATE
 =for apidoc Amnh||WARN_EXPERIMENTAL
-=for apidoc Amnh||WARN_EXPERIMENTAL__LEXICAL_SUBS
 =for apidoc Amnh||WARN_EXPERIMENTAL__REGEX_SETS
 =for apidoc Amnh||WARN_EXPERIMENTAL__SMARTMATCH
-=for apidoc Amnh||WARN_EXPERIMENTAL__POSTDEREF
-=for apidoc Amnh||WARN_EXPERIMENTAL__SIGNATURES
 =for apidoc Amnh||WARN_SYSCALLS
-=for apidoc Amnh||WARN_EXPERIMENTAL__BITWISE
 =for apidoc Amnh||WARN_EXPERIMENTAL__CONST_ATTR
 =for apidoc Amnh||WARN_EXPERIMENTAL__RE_STRICT
 =for apidoc Amnh||WARN_EXPERIMENTAL__REFALIASING
@@ -317,13 +303,10 @@ category parameters passed.
 =for apidoc Amnh||WARN_MISSING
 =for apidoc Amnh||WARN_REDUNDANT
 =for apidoc Amnh||WARN_EXPERIMENTAL__DECLARED_REFS
-=for apidoc Amnh||WARN_EXPERIMENTAL__ALPHA_ASSERTIONS
-=for apidoc Amnh||WARN_EXPERIMENTAL__SCRIPT_RUN
 =for apidoc Amnh||WARN_SHADOW
 =for apidoc Amnh||WARN_EXPERIMENTAL__PRIVATE_USE
 =for apidoc Amnh||WARN_EXPERIMENTAL__UNIPROP_WILDCARDS
 =for apidoc Amnh||WARN_EXPERIMENTAL__VLB
-=for apidoc Amnh||WARN_EXPERIMENTAL__ISA
 =for apidoc Amnh||WARN_EXPERIMENTAL__TRY
 =for apidoc Amnh||WARN_EXPERIMENTAL__ARGS_ARRAY_WITH_SIGNATURES
 =for apidoc Amnh||WARN_EXPERIMENTAL__BUILTIN