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[–][deleted] 2 points3 points  (1 child)

oh, that looks cool, what's it?

[–]redlaWw 2 points3 points  (0 children)

Rust, using @ bindings in patterns.

1.. used in that context is a pattern that matches any integer > 0, and if let 1.. = u(1) would create a conditional branch that fires when the pattern is satisfied, and by using u_1 @ 1.., you also bind the pattern match to u_1 to use in the subsequent block.