Affects Version/s: Minecraft 18w20a
Fix Version/s: None
Windows 7 Professional 32bit, 4Gb memory.
Minecraft Java launcher version 2.0.1049.
This also happened with snapshot 18w19b (never tried 18w19a) but not the previous 18w16a. I tried to add the other snapshot but the system refused.
I try to start the snapshot, the Mojang splash screen briefly shows and immediately disappears after the launcher informs me about a game crash. I've attached the launcher logfile which shows a peculiar error / stacktrace.
Also noteworthy: I can rule out any external influences (such as resource packs) because when I move my .minecraft folder out of the way (rename it) and then start fully fresh the exact same thing happens to me.
To summarize a bit, the main error message which I get to see (also in the regular log) is this:
You can find the full stacktrace in the attached logfile.
(edit): Forgot to mention: sometimes the crash is so severe that the whole launcher crashes as well.