id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	os	architecture	failure	difficulty	testcase	blockedby	blocking	related
3983	-O2 makes exception disappear	benjamin_scarlet	simonpj	"In this example, an exception throw/catch seems not to happen when optimization is turned on. The behavior seems to be quite finicky. Collapsing the code into fewer than the three given modules seems either to make the bug go away or to produce a ""internal error: PAP object entered!"" message. Other seemingly innocuous changes produce similar results.

On both Linux and MacOS, this program produces ""False"" with no optimization flags to ghc, or ""True"" with -O2.

On 6.10.4 on Linux, it produces ""False"" with or without -O2.
"	bug	closed	low	7.0.1	Compiler	6.12.1	fixed	exception optimization		Unknown/Multiple	x86_64 (amd64)	None/Unknown		simplCore/should_run/T3983	3959	4229, 4241