error: expected type, found `,` --> $DIR/issue-86053-1.rs:10:47 | LL | fn ordering4 < 'a , 'b > ( a : , self , self , self , | ^ expected type error: unexpected `self` parameter in function --> $DIR/issue-86053-1.rs:10:51 | LL | fn ordering4 < 'a , 'b > ( a : , self , self , self , | ^^^^ must be the first parameter of an associated function error: unexpected `self` parameter in function --> $DIR/issue-86053-1.rs:10:58 | LL | fn ordering4 < 'a , 'b > ( a : , self , self , self , | ^^^^ must be the first parameter of an associated function error: unexpected `self` parameter in function --> $DIR/issue-86053-1.rs:10:67 | LL | fn ordering4 < 'a , 'b > ( a : , self , self , self , | ^^^^ must be the first parameter of an associated function error: unexpected `self` parameter in function --> $DIR/issue-86053-1.rs:11:5 | LL | self , ... , self , self , ... ) where F : FnOnce ( & 'a & 'b usize ) { | ^^^^ must be the first parameter of an associated function error: unexpected `self` parameter in function --> $DIR/issue-86053-1.rs:11:20 | LL | self , ... , self , self , ... ) where F : FnOnce ( & 'a & 'b usize ) { | ^^^^ must be the first parameter of an associated function error: unexpected `self` parameter in function --> $DIR/issue-86053-1.rs:11:29 | LL | self , ... , self , self , ... ) where F : FnOnce ( & 'a & 'b usize ) { | ^^^^ must be the first parameter of an associated function error: `...` must be the last argument of a C-variadic function --> $DIR/issue-86053-1.rs:11:12 | LL | self , ... , self , self , ... ) where F : FnOnce ( & 'a & 'b usize ) { | ^^^ error: only foreign or `unsafe extern "C"` functions may be C-variadic --> $DIR/issue-86053-1.rs:11:12 | LL | self , ... , self , self , ... ) where F : FnOnce ( & 'a & 'b usize ) { | ^^^ error: only foreign or `unsafe extern "C"` functions may be C-variadic --> $DIR/issue-86053-1.rs:11:36 | LL | self , ... , self , self , ... ) where F : FnOnce ( & 'a & 'b usize ) { | ^^^ error[E0412]: cannot find type `F` in this scope --> $DIR/issue-86053-1.rs:11:48 | LL | self , ... , self , self , ... ) where F : FnOnce ( & 'a & 'b usize ) { | ^ --> $SRC_DIR/core/src/ops/function.rs:LL:COL | = note: similarly named trait `Fn` defined here | help: a trait with a similar name exists | LL | self , ... , self , self , ... ) where Fn : FnOnce ( & 'a & 'b usize ) { | ~~ help: you might be missing a type parameter | LL | fn ordering4 < 'a , 'b, F > ( a : , self , self , self , | +++ error: aborting due to 11 previous errors For more information about this error, try `rustc --explain E0412`.