error[E0425]: cannot find value `NonExistent` in this scope
  --> $DIR/ambiguous-builtin-attrs.rs:30:5
   |
LL |     NonExistent;
   |     ^^^^^^^^^^^ not found in this scope

error[E0659]: `repr` is ambiguous (built-in attribute vs any other name)
  --> $DIR/ambiguous-builtin-attrs.rs:9:3
   |
LL | #[repr(C)]
   |   ^^^^ ambiguous name
   |
   = note: `repr` could refer to a built-in attribute
note: `repr` could also refer to the attribute macro imported here
  --> $DIR/ambiguous-builtin-attrs.rs:7:5
   |
LL | use builtin_attrs::*;
   |     ^^^^^^^^^^^^^^^^
   = help: use `crate::repr` to refer to this attribute macro unambiguously

error[E0659]: `repr` is ambiguous (built-in attribute vs any other name)
  --> $DIR/ambiguous-builtin-attrs.rs:11:19
   |
LL | #[cfg_attr(all(), repr(C))]
   |                   ^^^^ ambiguous name
   |
   = note: `repr` could refer to a built-in attribute
note: `repr` could also refer to the attribute macro imported here
  --> $DIR/ambiguous-builtin-attrs.rs:7:5
   |
LL | use builtin_attrs::*;
   |     ^^^^^^^^^^^^^^^^
   = help: use `crate::repr` to refer to this attribute macro unambiguously

error[E0659]: `repr` is ambiguous (built-in attribute vs any other name)
  --> $DIR/ambiguous-builtin-attrs.rs:20:34
   |
LL | fn non_macro_expanded_location<#[repr(C)] T>() {
   |                                  ^^^^ ambiguous name
   |
   = note: `repr` could refer to a built-in attribute
note: `repr` could also refer to the attribute macro imported here
  --> $DIR/ambiguous-builtin-attrs.rs:7:5
   |
LL | use builtin_attrs::*;
   |     ^^^^^^^^^^^^^^^^
   = help: use `crate::repr` to refer to this attribute macro unambiguously

error[E0659]: `repr` is ambiguous (built-in attribute vs any other name)
  --> $DIR/ambiguous-builtin-attrs.rs:22:11
   |
LL |         #[repr(C)]
   |           ^^^^ ambiguous name
   |
   = note: `repr` could refer to a built-in attribute
note: `repr` could also refer to the attribute macro imported here
  --> $DIR/ambiguous-builtin-attrs.rs:7:5
   |
LL | use builtin_attrs::*;
   |     ^^^^^^^^^^^^^^^^
   = help: use `crate::repr` to refer to this attribute macro unambiguously

error[E0659]: `feature` is ambiguous (built-in attribute vs any other name)
  --> $DIR/ambiguous-builtin-attrs.rs:3:4
   |
LL | #![feature(decl_macro)]
   |    ^^^^^^^ ambiguous name
   |
   = note: `feature` could refer to a built-in attribute
note: `feature` could also refer to the attribute macro imported here
  --> $DIR/ambiguous-builtin-attrs.rs:7:5
   |
LL | use builtin_attrs::*;
   |     ^^^^^^^^^^^^^^^^
   = help: use `crate::feature` to refer to this attribute macro unambiguously

error: aborting due to 6 previous errors

Some errors have detailed explanations: E0425, E0659.
For more information about an error, try `rustc --explain E0425`.