miniblog.

TIL Tcl has a notion of 'safe interpreters', a mode where you can run untrusted code in a sandbox: https://www.tcl.tk/man/tcl8.4/TclCmd/safe.htm Not many programming languages have this, but it's way safer to include in the implementation than try to build as a userland library.

TIL that C++03 considered a file without a trailing newline to be undefined behaviour! https://stackoverflow.com/a/72377 This was fixed in C++11, but the problem was that #include was a textual operation that could produce invalid syntax if no newline was present.

The Rust docs include a surprisingly readable example of how `for` loops desugar into essentially a while loop with a pattern match: