[PHP-BUG] Req #75576 [NEW]: C++-like function-try-blocks

From:             enclaved at safe-mail dot net
Operating system: All
PHP version:      7.2Git-2017-11-27 (Git)
Package:          PHP Language Specification
Bug Type:         Feature/Change Request
Bug description:C++-like function-try-blocks

Description:
------------
I am proposing a patch to bring C++-like function-try-block shorthand
syntax for whole-function try-catch-finally blocks:

function fuu($foo, $bar): void try
{
  may_throw($foo);
  may_throw($bar);
} catch (FuuException $e) {
  echo $e->getMessage();
}

The proposed patch is attached. It makes purely cosmetic modifications
to zend_language_parser.y grammar to augment plain functions, class
methods, and closures to accept try-catch-finally blocks as their bodies
in addition to regular compound statements.  It amounts to just a
handful of lines and entails no API changes.

Test script:
---------------
function coyote(bool $acme): void try
{
  echo "Coyote";
  if ($acme) {
    throw new RuntimeException;
  }
} catch (RuntimeException $e) {
  /*
   * Coyote succeeds.
   */
} finally {
  if (empty($e)) {
    echo " never";
  }
  echo " catches Roadrunner", PHP_EOL;
}

coyote(false);
coyote(true);


-- 
Edit bug report at https://bugs.php.net/bug.php?id=75576&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=75576&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=75576&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=75576&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=75576&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=75576&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=75576&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=75576&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=75576&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=75576&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=75576&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=75576&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=75576&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=75576&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75576&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=75576&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=75576&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=75576&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=75576&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=75576&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=75576&r=mysqlcfg