Symfony 3.2 PHP Error not displayed - symfony

Question

I have an almost fresh install of Symfony 3.2 and it appears not to be capturing and displaying PHP errors.
To test, I have omitted the final semicolon from a line in a working controller. When I try to access the route a blank screen is displayed (the app returns nothing). This is in the dev environment. The error is logged by Symfony, but it is not handled and displayed by the debug component. This is my first version 3 project - I have previously worked in version 2 where the nicely formatted error would be returned for such an error.
Any ideas how to fix this?
I am on PHP version 5.5.9.
The relevant lines in the Symfony log are:
php.CRITICAL: Fatal Parse Error: syntax error, unexpected 'return' (T_RETURN) {"exception":"[object] (Symfony\Component\Debug\Exception\FatalErrorException(code: 0): Parse Error: syntax error, unexpected 'return' (T_RETURN) at /var/www/html/tcfdev/src/AppBundle/Controller/HomeController.php:17)"} []
and
request.CRITICAL: Uncaught PHP Exception Symfony\Component\Debug\Exception\FatalErrorException: "Parse Error: syntax error, unexpected 'return' (T_RETURN)" at /var/www/html/tcfdev/src/AppBundle/Controller/HomeController.php line 17 {"exception":"[object] (Symfony\Component\Debug\Exception\FatalErrorException(code: 0): Parse Error: syntax error, unexpected 'return' (T_RETURN) at /var/www/html/tcfdev/src/AppBundle/Controller/HomeController.php:17)"} []
The apache2 log contains the following:
PHP Parse error: syntax error, unexpected 'return' (T_RETURN) in /var/www/html/tcfdev/src/AppBundle/Controller/HomeController.php on line 17
So it appears that debug is picking it up but failing to display it.

Answer 1

An almost fresh install? Did you get this from another project? Does your routing_dev.yml have the profiler and errors setup?
It should look something like this:
_wdt:
resource: "#WebProfilerBundle/Resources/config/routing/wdt.xml"
prefix: /_wdt
_profiler:
resource: "#WebProfilerBundle/Resources/config/routing/profiler.xml"
prefix: /_profiler
_errors:
resource: "#TwigBundle/Resources/config/routing/errors.xml"
prefix: /_error
_main:
resource: routing.yml