error[E0275]: overflow evaluating the requirement `K: Send` --> $DIR/recursion_limit.rs:34:5 | LL | is_send::(); | ^^^^^^^^^^^^ | = help: consider increasing the recursion limit by adding a `#![recursion_limit = "20"]` attribute to your crate (`recursion_limit`) note: required because it appears within the type `J` --> $DIR/recursion_limit.rs:24:9 | LL | link! { J, K } | ^ note: required because it appears within the type `I` --> $DIR/recursion_limit.rs:23:9 | LL | link! { I, J } | ^ note: required because it appears within the type `H` --> $DIR/recursion_limit.rs:22:9 | LL | link! { H, I } | ^ note: required because it appears within the type `G` --> $DIR/recursion_limit.rs:21:9 | LL | link! { G, H } | ^ note: required because it appears within the type `F` --> $DIR/recursion_limit.rs:20:9 | LL | link! { F, G } | ^ note: required because it appears within the type `E` --> $DIR/recursion_limit.rs:19:9 | LL | link! { E, F } | ^ note: required because it appears within the type `D` --> $DIR/recursion_limit.rs:18:9 | LL | link! { D, E } | ^ note: required because it appears within the type `C` --> $DIR/recursion_limit.rs:17:9 | LL | link! { C, D } | ^ note: required because it appears within the type `B` --> $DIR/recursion_limit.rs:16:9 | LL | link! { B, C } | ^ note: required because it appears within the type `A` --> $DIR/recursion_limit.rs:15:9 | LL | link! { A, B } | ^ note: required by a bound in `is_send` --> $DIR/recursion_limit.rs:31:14 | LL | fn is_send() { } | ^^^^ required by this bound in `is_send` error: aborting due to previous error For more information about this error, try `rustc --explain E0275`.