I found how to easily reproduce it every time

1) Open Spotter and search for addMiscExtrasTo: , locate it at Morph class, then press enter to open it in browser

2) Boom MNU

looking at

[..] inAstCache

at: aCompiledMethod
^ self at: aCompiledMethod ifAbsentPut:
[ aCompiledMethod parseTree doSemanticAnalysisIn: aCompiledMethod methodClass ]

The problem here is even though aCompiledMethod returns the correct method in this case

Morph>>#addMiscExtrasTo:

the aCompiledMethod parseTree returns nil and this is why it MNUs with doSemanticAnalysisIn: complaining about a nil receiver which is the case

anyone have a clue why its nil ?

if I try to browser parseTree it again gives me a MNU and redbox of doom makes it impossible to view the method.

Deadends everywhere .

On Fri, Nov 27, 2015 at 2:17 PM Dimitris Chloupis <kilon.alios@gmail.com> wrote:

well the blue theme I am using is called Nireas, made by me. Its inspired from best computer ever, Amiga 500

^ that's Amiga's OS

On Fri, Nov 27, 2015 at 2:11 PM Christophe Demarey <Christophe.Demarey@inria.fr> wrote:

Le 27 nov. 2015 �� 12:28, Nicolai Hess a ��crit :

Wow what an awful bug, it turned you whole screen in ugly blue!
:)

like�� a windows system error