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`.