error: interning a defined symbol
  --> tests/ui-internal/interning_defined_symbol.rs:17:13
   |
LL |     let _ = Symbol::intern("f32");
   |             ^^^^^^^^^^^^^^^^^^^^^ help: try: `rustc_span::sym::f32`
   |
note: the lint level is defined here
  --> tests/ui-internal/interning_defined_symbol.rs:1:9
   |
LL | #![deny(clippy::internal)]
   |         ^^^^^^^^^^^^^^^^
   = note: `#[deny(clippy::interning_defined_symbol)]` implied by `#[deny(clippy::internal)]`

error: interning a defined symbol
  --> tests/ui-internal/interning_defined_symbol.rs:20:13
   |
LL |     let _ = sym!(f32);
   |             ^^^^^^^^^ help: try: `rustc_span::sym::f32`

error: interning a defined symbol
  --> tests/ui-internal/interning_defined_symbol.rs:23:13
   |
LL |     let _ = Symbol::intern("proc-macro");
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: try: `rustc_span::sym::proc_dash_macro`

error: interning a defined symbol
  --> tests/ui-internal/interning_defined_symbol.rs:26:13
   |
LL |     let _ = Symbol::intern("self");
   |             ^^^^^^^^^^^^^^^^^^^^^^ help: try: `rustc_span::symbol::kw::SelfLower`

error: aborting due to 4 previous errors