Update day4.md

Extended explanation for desugar-all question.
Clarification of day8 this expressions.

Clarification of day8 this expressions.
Merge pull request #6 from Calavoow/patch-1

Update day4.md
Update day4.md
Merge pull request #7 from rogierslag/master

fixed incorrect type
Update day8.md
instructions for getting desugared ASTs
Merge pull request #8 from norberhuis/master

Clarification of day8 this expressions.
clrification on `this`
Error messages with TS.
Merge pull request #9 from mbrobbel/update

Error messages with TS.
fixed example
constraints in TS
Update day8.md
Fix trans/minijava.str fix code formatting
Merge pull request #10 from arian/patch-1

Fix trans/minijava.str fix code formatting
Update day8.md
Update and rename day7.md to day10.md
Update and rename day8.md to day11.md
Update and rename day9.md to day12.md