alt Hacker Newsbtw. Fortran is implicitly behaving as "restrict" by default, which makes sense together with its intuitive "intent" system for function/subroutine arguments. This is one of the biggest reasons why it's still so popular in HPC - scientists can pretty much just write down their equations, follow a few simple rules (e.g. on storage order) and out comes fairly performant machine code. Doing the same (a 'naive' first implementation) in C or C++ usually leads to something severely degraded compared to the theoretical limits of a given algorithm on given hardware.
Oh I actually had some editing mistake, I meant to say that also Rust has restrict by default, by virtue of all references being unique xor readonly.
As I understand it, the Fortran compiler just expects your code to respect the "restrictness", it doesn't enforce it.