"Pattern matching friendly"

[bluss]

ndarray-design/src/core/layout/patterned.rs

Line 12 in adea1e0

/// Convert the dimension into a pattern matching friendly value.

Sorry for starting with a comment on the "least important".

Once upon a time, Rust could do patterns with tuples but not with arrays:

let (x, y) = obj1;  // OK
let [x, y] = obj2;  // used to be invalid syntax.

But this is no longer the case. Both (x, y) and [x, y] are valid patterns since "some" time (for pairs and arrays-of-2 respectively). So this was the origin of "pattern matching friendly" for tuples here.

With that said, patterned/as_pattern probably still plays a role when we grow the number of ways to specify layout, for example when const length axes are in play?