error: no method named `f9` found for type `usize` in the current scope
  --> $DIR/issue-7575.rs:74:18
   |
74 |     u.f8(42) + u.f9(342) + m.fff(42)
   |                  ^^
   |
   = 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:16:5
   |
16 |     fn f9(usize) -> usize; //~ NOTE candidate
   |     ^^^^^^^^^^^^^^^^^^^^^^
   = help: to disambiguate the method call, write `CtxtFn::f9(u, 342)` instead
note: candidate #2 is defined in the trait `OtherTrait`
  --> $DIR/issue-7575.rs:20:5
   |
20 |     fn f9(usize) -> usize; //~ NOTE candidate
   |     ^^^^^^^^^^^^^^^^^^^^^^
   = help: to disambiguate the method call, write `OtherTrait::f9(u, 342)` instead
note: candidate #3 is defined in the trait `UnusedTrait`
  --> $DIR/issue-7575.rs:29:5
   |
29 |     fn f9(usize) -> usize; //~ NOTE candidate
   |     ^^^^^^^^^^^^^^^^^^^^^^
   = help: to disambiguate the method call, write `UnusedTrait::f9(u, 342)` instead
   = help: items from traits can only be used if the trait is implemented and in scope; the following traits define an item `f9`, perhaps you need to implement one of them:
   = help: candidate #1: `CtxtFn`
   = help: candidate #2: `OtherTrait`
   = help: candidate #3: `UnusedTrait`

error: no method named `fff` found for type `Myisize` in the current scope
  --> $DIR/issue-7575.rs:74:30
   |
74 |     u.f8(42) + u.f9(342) + m.fff(42)
   |                              ^^^
   |
   = note: found the following associated functions; to be used as methods, functions must have a `self` parameter
note: candidate #1 is defined in an impl for the type `Myisize`
  --> $DIR/issue-7575.rs:51:5
   |
51 |       fn fff(i: isize) -> isize { //~ NOTE candidate
   |  _____^ starting here...
52 | |         i
53 | |     }
   | |_____^ ...ending here

error: no method named `is_str` found for type `T` in the current scope
  --> $DIR/issue-7575.rs:85:7
   |
85 |     t.is_str()
   |       ^^^^^^
   |
   = 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 `ManyImplTrait`
  --> $DIR/issue-7575.rs:57:5
   |
57 |       fn is_str() -> bool { //~ NOTE candidate
   |  _____^ starting here...
58 | |         false
59 | |     }
   | |_____^ ...ending here
   = help: to disambiguate the method call, write `ManyImplTrait::is_str(t)` instead
   = help: items from traits can only be used if the trait is implemented and in scope; the following trait defines an item `is_str`, perhaps you need to implement it:
   = help: candidate #1: `ManyImplTrait`

error: aborting due to 3 previous errors