In 2022 I followed this course, compiler construction, by professor Eelco Visser.
I may not have always agreed with him, but that is normal in academics.
I still remember his teaching well, 
and I periodically come back to these slides since they're super instructive even when not using Spoofax,
his language workbench research project in which he poored a large part of his life.
[In 2022, only days after my final exam of this course, he unfortunately passed away far too early.](https://www.tudelft.nl/2022/ewi/in-memoriam-eelco-visser-1966-2022)
These are the slides and course website for 2021, since the version of 2022 is no longer online.
As such I wanted to preserve this information, since it looks like it might be lost to time otherwise.
Just to say this again, I only do this to preserve invaluable knowledgethat may otherwise be lost.
I do not mean to infringe on copyright otherwise.