error[E0223]: ambiguous associated type
  --> $DIR/suggest-std-when-using-type.rs:2:14
   |
LL |     let pi = f32::consts::PI;
   |              ^^^^^^^^^^^^^^^
help: you are looking for the module in `std`, not the primitive type
   |
LL |     let pi = std::f32::consts::PI;
   |              ^^^^^^^^^^^^^^^^^^^^

error[E0599]: no function or associated item named `from_utf8` found for type `str` in the current scope
  --> $DIR/suggest-std-when-using-type.rs:5:14
   |
LL |         str::from_utf8(bytes)
   |              ^^^^^^^^^ function or associated item not found in `str`
help: you are looking for the module in `std`, not the primitive type
   |
LL |         std::str::from_utf8(bytes)
   |         ^^^^^^^^^^^^^^^^^^^

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0223, E0599.
For more information about an error, try `rustc --explain E0223`.