Alter Syntax for Lambda expressions

[Feliix42]

The current semantic is:

let f = fn (d) {calculate(d, x)};

While the Rust-native way would be a construct like this:

let f = |d| calculate(d, x);

For further reference, you may also have a look at the reference.

I think it would be better to alter the syntax and transition to the native closure syntax for more comfort during development.
But as of now, this is not an urgent topic.

[sertel]

Also eigentlich ist das:

let f = |d| -> () { calculate(d,x); };

Obiges ist nur eine kürzere Art und Weise dies zu schreiben. Das müssen wir aber wirklich nicht unterstützen. (Zumindest nicht zu Beginn.)

[Feliix42]

Not exactly. The type of the above statements in my comment both produce a value, the return value of calculate. The semicolon in your example is too much.

let f = |d| -> i32 { calculate(d, x) };

But this is explained in the reference along with the grammar rules that form such an expression.

[sertel]

Now that is misleading Rust syntax, at least to me.

[Feliix42]

But it's the same for the original fn syntax, isn't it? 😄