Expose ignored error snapshot

Co-Authored-By: Andrew Kesterson <andrew@aklabs.net>

tests/MUTATION.md

@@ -107,7 +107,7 @@ The remaining survivors are dominated by:
 
 * **Equivalent mutants** in `akerr_init`: deleting the `memset`/`NULL` setup of
   file-scope statics (`AKERR_ARRAY_ERROR`, `__akerr_last_ditch`,
-  `__akerr_last_ignored`) changes nothing, because C already zero-initializes
+  `akerr_last_ignored`) changes nothing, because C already zero-initializes
   objects with static storage duration. `int oldid = 0;` → `1` is likewise
   dead: it is overwritten before use, and so is clearing `akerr_initializing`
   at the end of initialization — nothing reads that flag once the once-routine

tests/err_ignore.c

@@ -24,8 +24,8 @@ int main(void)
      * iteration. */
     for ( int i = 0; i < AKERR_MAX_ARRAY_ERROR + 1; i++ ) {
 	IGNORE(boom());
-	AKERR_CHECK(__akerr_last_ignored.status == AKERR_VALUE);
-	AKERR_CHECK(strcmp(__akerr_last_ignored.message,
+	AKERR_CHECK(akerr_last_ignored.status == AKERR_VALUE);
+	AKERR_CHECK(strcmp(akerr_last_ignored.message,
 			  "this error is ignored on purpose") == 0);
 	AKERR_CHECK(akerr_slots_in_use() == 0);
     }

tests/err_threads_pool.c

@@ -103,8 +103,8 @@ static void *pool_body(void *raw)
     /* IGNORE's snapshot is thread-local while logging and remains valid after
      * release. Concurrent ignored errors must all return their pool slots. */
     IGNORE(ignorable(arg));
-    AKERR_TCHECK(arg, __akerr_last_ignored.status == AKERR_IO);
-    AKERR_TCHECK(arg, strcmp(__akerr_last_ignored.message, expected) == 0);
+    AKERR_TCHECK(arg, akerr_last_ignored.status == AKERR_IO);
+    AKERR_TCHECK(arg, strcmp(akerr_last_ignored.message, expected) == 0);
 
     /* Reuse a slot after IGNORE and prove that the copied snapshot did not
      * become an alias for the newly acquired context. */
@@ -113,8 +113,8 @@ static void *pool_body(void *raw)
     if ( reused != NULL ) {
 	RELEASE_ERROR(reused);
     }
-    AKERR_TCHECK(arg, __akerr_last_ignored.status == AKERR_IO);
-    AKERR_TCHECK(arg, strcmp(__akerr_last_ignored.message, expected) == 0);
+    AKERR_TCHECK(arg, akerr_last_ignored.status == AKERR_IO);
+    AKERR_TCHECK(arg, strcmp(akerr_last_ignored.message, expected) == 0);
 
     return NULL;
 }