Yeah rust totally changed my opinion on mutability. When I first started using it I thought that the lack of explicitly immutable struct members was a glaring f

Yeah rust totally changed my opinion on mutability. When I first started using it I thought that the lack of explicitly immutable struct members was a glaring flaw in the language, but it turns out the ability to choose between ownership, reference and mutable reference at function/method callsites is just as useful for ensuring correctness.