borrowck does not distinguish between "argument" and "local variable" anymore

[Swatinem]

The following example:

fn foo(v: Vec<u32>) {
    v.push(4);
}

fn main() {
    foo(vec![1, 2, 3]);
}

generates the following error:

mut.rs:2:5: 2:6 error: cannot borrow immutable local variable `v` as mutable
mut.rs:2     v.push(4);
             ^

A few month ago, it used to say "argument" instead of "local variable".

I already found the code that does this, still need to figure out how to fix it, give me a few days :-)

[Swatinem]

https://github.com/rust-lang/rust/blob/master/src/librustc/middle/mem_categorization.rs#L1534

I will always get a NodeLocal here for some reason. Still need to figure out why that happens.