Internal compiler error due to invalid integer literal

[j-tai]

fn main() {
    1x;
}

The invalid integer literal 1x causes clippy to panic.

error: invalid suffix `x` for numeric literal
 --> src/main.rs:2:5
  |
2 |     1x;
  |     ^^ invalid suffix `x`
  |
  = help: the suffix must be one of the integral types (`u32`, `isize`, etc)

thread 'rustc' panicked at 'called `Result::unwrap()` on an `Err` value: ParseIntError { kind: InvalidDigit }', src/libcore/result.rs:997:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
stack backtrace:
   0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at src/libstd/sys/unix/backtrace/tracing/gcc_s.rs:39
   1: std::sys_common::backtrace::_print
             at src/libstd/sys_common/backtrace.rs:70
   2: std::panicking::default_hook::{{closure}}
             at src/libstd/sys_common/backtrace.rs:58
             at src/libstd/panicking.rs:200
   3: std::panicking::default_hook
             at src/libstd/panicking.rs:215
   4: rustc::util::common::panic_hook
   5: std::panicking::rust_panic_with_hook
             at src/libstd/panicking.rs:482
   6: std::panicking::continue_panic_fmt
             at src/libstd/panicking.rs:385
   7: rust_begin_unwind
             at src/libstd/panicking.rs:312
   8: core::panicking::panic_fmt
             at src/libcore/panicking.rs:85
   9: core::result::unwrap_failed
  10: <clippy_lints::literal_representation::LiteralRepresentation as rustc::lint::EarlyLintPass>::check_expr
  11: <rustc::lint::context::EarlyContext<'a> as syntax::visit::Visitor<'a>>::visit_expr
  12: <rustc::lint::context::EarlyContext<'a> as syntax::visit::Visitor<'a>>::visit_block
  13: <rustc::lint::context::EarlyContext<'a> as syntax::visit::Visitor<'a>>::visit_fn
  14: syntax::visit::walk_item
  15: <rustc::lint::context::EarlyContext<'a> as syntax::visit::Visitor<'a>>::visit_item
  16: <rustc::lint::context::EarlyContext<'a> as syntax::visit::Visitor<'a>>::visit_mod
  17: rustc::lint::context::check_ast_crate
  18: rustc::util::common::time
  19: rustc_driver::driver::phase_2_configure_and_expand
  20: rustc_driver::driver::compile_input
  21: rustc_driver::run_compiler_with_pool
  22: <scoped_tls::ScopedKey<T>>::set
  23: rustc_driver::run_compiler
  24: <scoped_tls::ScopedKey<T>>::set
query stack during panic:
end of query stack
error: aborting due to previous error


error: internal compiler error: unexpected panic

note: the compiler unexpectedly panicked. this is a bug.

note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports

note: rustc 1.33.0 (2aa4c46cf 2019-02-28) running on x86_64-unknown-linux-gnu

note: compiler flags: -C debuginfo=2 -C incremental --crate-type bin

note: some of the compiler flags provided by cargo are hidden