Smalltalk takes a hardline view on syntax errors and undefined variables: you can't save a new method until it's fixed.
It's a nice way to work, as methods tend to be small, so virtually all your code is in a runnable state all the time.
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Some excellent safety improvements in C++26: hardening the standard library against out-of-bounds bugs, and a safer semantics for uninitialised local variables:
An incredible 7 minute demo of APL, going from constructing an array to visualising Conway's Game Of Life, built incrementally without loops or temporary variables: https://www.youtube.com/watch?v=a9xAKttWgP4
What piece of syntax has the most different meanings?
I realised today that `as` is extremely overloaded. It can be used for aliasing imports (Python), type casts (Rust), binding pattern match variables (OCaml), type assertions (Hack) and probably many others.