About 80% of ways of doing memory corruption in C are just not possible, unless one explicitly turns off safety constructs.
The developer culture was also that workable software and quality comes before performance tricks.
Many OSes were written in Pascal variants, Modula-2, Modula-2+, Modula-3, Oberon, Oberon-2, Active Oberon, Component Pascal, Concurrent Pascal.
There are still very few programming languages that can match Delphi RAD capabilities, while producing a fat free executable.
We were quite productive in them before UNIX took over the industry and brought C with it. The JavaScript and PHP of systems programming languages.
Nim is a good counterexample to Wirth's philosophy showing program readability, dev speed, and runtime performance can all go up if we increase language/compiler complexity where it makes sense. So, the reason Nim is a great project is that it's not a Wirth language. Look at Component Pascal if you want to see one like he'd want for industrial use. It was even commercialized with Blackbox at one point.
Why didn't anyone write a Wirth-language -> C translator, and wasn't it successful?
Eiffel works just like that, JIT/VM for development, compilation via C for deployment.
P2C was a famous one https://www.gsp.com/cgi-bin/man.cgi?section=1&topic=p2c
http://www.zi.biologie.uni-muenchen.de/~enger/SC22WG13/im2c-...
https://github.com/jtempl/ofront
But beyond Eiffel, most developers ended up moving mostly to C++ (like myself back then) as it provided the C compatibility, with most of the Pascal's safety if one cared to use the C++ features.
Then Java took over the show for security minded developers during a couple of years, until we finally arrived at Go, D, Swift, Rust, .NET Native, SubstrateVM.
IMO they weren't successful because you actually need good 'marketing' to make a strict and safe language popular. For most people it will feel like having to fight the compiler to accept your code. The Rust community does a really good job informing developers that it is definitely worth the trouble.
I can't think of anything "modern" that comes close to that, most languages these days are quite feature sink-y. And yes, that includes Go, if we consider Oberon to be somewhat of a baseline.
Heck, even his successor's language (Eiffel) is more minimal than what's hip these days.
> Pascal generally has one way to do a thing, the right way.
Right up through Object Pascal I always felt that was the case and in 2018 it's only now that VS2017 feels nearly as productive as Delphi 6 did nearly 20 years ago.
Aside from Free Pascal w/ Lazarus, the closest thing to that experience today is Go language with Oberon-like style, safer-by-default, and fast compiles. One of its inventors stated a design goal was realizing the fast-paced, smooth experience he had with Oberon-2 in the past.
1e6+ lines of code can still easily be a project you can be productive in.