[ICE] the lexer and the preprocessor have trouble getting along

[jyn514]

Code

#if\

2/
Message:  expected `tokens_until_newline()` to reset `seen_line_token`, but `lexer.peek()` is Some(47)
Location: src/lex/cpp.rs:411

Expected behavior

When the preprocessor calls consume_whitespace, it consumes all the whitespace, not just the single line.

Backtrace

The application panicked (crashed).
Message:  expected `tokens_until_newline()` to reset `seen_line_token`, but `lexer.peek()` is Some(47)
Location: src/lex/cpp.rs:411

Run with RUST_BACKTRACE=full to include source snippets.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
                          (5 post panic frames hidden)                          
 5: rcc::lex::cpp::PreProcessor::tokens_until_newline::he745648b9c6da68d
    at src/lex/cpp.rs:411
 6: rcc::lex::cpp::PreProcessor::cpp_expr::hd2d583d5b383188b
    at src/lex/cpp.rs:830
 7: rcc::lex::cpp::PreProcessor::boolean_expr::hdaf7ae73e633a95f
    at src/lex/cpp.rs:738
 8: rcc::lex::cpp::PreProcessor::directive::hcba5a304072f52d6
    at src/lex/cpp.rs:502
 9: <rcc::lex::cpp::PreProcessor as core::iter::traits::iterator::Iterator>::next::hb4b76254fce30a67
    at src/lex/cpp.rs:209
10: rcc::check_semantics::hd31cdd4033b22724
    at src/lib.rs:170
11: rcc::compile::h7e7691f880c5ebf4
    at /home/joshua/src/rust/rcc/src/lib.rs:218
12: rcc::aot_main::h8def1ca0324b8884
    at src/main.rs:134
13: rcc::real_main::h192812ffe776ee2f
    at src/main.rs:122
14: rcc::main::hc67a23664e8d7b5c
    at src/main.rs:200