error[E0599]: no method named `f9` found for type `usize` in the current scope
  --> $DIR/issue-7575.rs:62:18
   |
LL |     u.f8(42) + u.f9(342) + m.fff(42)
   |                  ^^ this is an associated function, not a method
   |
   = note: found the following associated functions; to be used as methods, functions must have a `self` parameter
note: candidate #1 is defined in the trait `CtxtFn`
  --> $DIR/issue-7575.rs:4:5
   |
LL |     fn f9(_: usize) -> usize;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
note: candidate #2 is defined in the trait `OtherTrait`
  --> $DIR/issue-7575.rs:8:5
   |
LL |     fn f9(_: usize) -> usize;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
note: candidate #3 is defined in the trait `UnusedTrait`
  --> $DIR/issue-7575.rs:17:5
   |
LL |     fn f9(_: usize) -> usize;
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^
   = help: items from traits can only be used if the trait is implemented and in scope
   = note: the following traits define an item `f9`, perhaps you need to implement one of them:
           candidate #1: `CtxtFn`
           candidate #2: `OtherTrait`
           candidate #3: `UnusedTrait`
help: disambiguate the associated function for candidate #1
   |
LL |     u.f8(42) + CtxtFn::f9(u, 342) + m.fff(42)
   |                ~~~~~~~~~~~~~~~~~~
help: disambiguate the associated function for candidate #2
   |
LL |     u.f8(42) + OtherTrait::f9(u, 342) + m.fff(42)
   |                ~~~~~~~~~~~~~~~~~~~~~~
help: disambiguate the associated function for candidate #3
   |
LL |     u.f8(42) + UnusedTrait::f9(u, 342) + m.fff(42)
   |                ~~~~~~~~~~~~~~~~~~~~~~~

error[E0599]: no method named `fff` found for struct `Myisize` in the current scope
  --> $DIR/issue-7575.rs:62:30
   |
LL | struct Myisize(isize);
   | ---------------------- method `fff` not found for this
...
LL |     u.f8(42) + u.f9(342) + m.fff(42)
   |                            --^^^
   |                            | |
   |                            | this is an associated function, not a method
   |                            help: use associated function syntax instead: `Myisize::fff`
   |
   = note: found the following associated functions; to be used as methods, functions must have a `self` parameter
note: the candidate is defined in an impl for the type `Myisize`
  --> $DIR/issue-7575.rs:39:5
   |
LL |     fn fff(i: isize) -> isize {
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0599]: no method named `is_str` found for type parameter `T` in the current scope
  --> $DIR/issue-7575.rs:70:7
   |
LL |     t.is_str()
   |       ^^^^^^ this is an associated function, not a method
   |
   = note: found the following associated functions; to be used as methods, functions must have a `self` parameter
note: the candidate is defined in the trait `ManyImplTrait`
  --> $DIR/issue-7575.rs:45:5
   |
LL |     fn is_str() -> bool {
   |     ^^^^^^^^^^^^^^^^^^^
   = help: items from traits can only be used if the type parameter is bounded by the trait
help: disambiguate the associated function for the candidate
   |
LL |     ManyImplTrait::is_str(t)
   |

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0599`.