[ICE] Macro expansion assertion failed

[pythongirl325]

Code

#define T()
T( ` )

Message:

The application panicked (crashed).
Message:  assertion failed: !matches!(args . last(), Some(Token :: Whitespace(_)))
Location: src/lex/replace.rs:280

Expected behavior

Error saying that ``` is an invalid character. (probably)

Backtrace

    Finished dev [unoptimized + debuginfo] target(s) in 0.05s
     Running `target/debug/swcc --color=never test.c`
The application panicked (crashed).
Message:  assertion failed: !matches!(args . last(), Some(Token :: Whitespace(_)))
Location: src/lex/replace.rs:280

Run with COLORBT_SHOW_HIDDEN=1 environment variable to disable frame filtering.
Run with RUST_BACKTRACE=full to include source snippets.
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ BACKTRACE ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
                              ⋮ 4 frames hidden ⋮                               
 5: saltwater::lex::replace::replace_function::strip_whitespace::h8309bcbb0f143edb
    at /home/gis/code/saltwater/src/lex/replace.rs:280
 6: saltwater::lex::replace::replace_function::h8e25009758ae6d78
    at /home/gis/code/saltwater/src/lex/replace.rs:314
 7: saltwater::lex::replace::replace::h7406a37dc332f835
    at /home/gis/code/saltwater/src/lex/replace.rs:180
 8: saltwater::lex::cpp::PreProcessor::handle_token::h4da91e8f99457e00
    at /home/gis/code/saltwater/src/lex/cpp.rs:284
 9: <saltwater::lex::cpp::PreProcessor as core::iter::traits::iterator::Iterator>::next::h7a2ccc5f7a2d0518
    at /home/gis/code/saltwater/src/lex/cpp.rs:248
10: <&mut I as core::iter::traits::iterator::Iterator>::next::hd5551b5762e8a36f
    at /home/gis/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/iter/traits/iterator.rs:3258
11: <core::iter::adapters::Peekable<I> as core::iter::traits::iterator::Iterator>::next::h213360103a6abc02
    at /home/gis/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/iter/adapters/mod.rs:1399
12: saltwater::parse::Parser<I>::__impl_next_token::hfeaf52746f7445bb
    at /home/gis/code/saltwater/src/parse/mod.rs:142
13: saltwater::parse::Parser<I>::peek_token::{{closure}}::ha9891d931dfc1b39
    at /home/gis/code/saltwater/src/parse/mod.rs:207
14: core::option::Option<T>::or_else::h56d9ccafaa98794f
    at /home/gis/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/option.rs:766
15: saltwater::parse::Parser<I>::peek_token::h89c2a9f52cf73082
    at /home/gis/code/saltwater/src/parse/mod.rs:207
16: <saltwater::parse::Parser<I> as core::iter::traits::iterator::Iterator>::next::h01b34dec7d042a69
    at /home/gis/code/saltwater/src/parse/mod.rs:107
17: <saltwater::analyze::Analyzer<T> as core::iter::traits::iterator::Iterator>::next::hb7aae02eae7cfe74
    at /home/gis/code/saltwater/src/analyze/mod.rs:95
18: <&mut I as core::iter::traits::iterator::Iterator>::next::h6ccd91b5947a96bc
    at /home/gis/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src/libcore/iter/traits/iterator.rs:3258
19: saltwater::check_semantics::ha40a786b537cf457
    at /home/gis/code/saltwater/src/lib.rs:240
20: saltwater::compile::hf9937d5e5682c4bb
    at /home/gis/code/saltwater/src/lib.rs:271
21: swcc::aot_main::h6585910bd9a711ec
    at /home/gis/code/saltwater/src/main.rs:172
22: swcc::real_main::h4a7b3b4b2e8a6631
    at /home/gis/code/saltwater/src/main.rs:161
23: swcc::main::h680d2fa7efb5314a
    at /home/gis/code/saltwater/src/main.rs:273
                              ⋮ 10 frames hidden ⋮                              

[hdamron17]

The expected behavior of ` being an invalid character is true for running in general, but if you run with -E it should go through. Unfortunately, lexer tokens are parsed before the preprocessor at the moment so some things which should be fine with -E still give a lexer error if the token is invalid. See #395.

[pythongirl325]

This was originally found with the character \x1f in place of the backquote, but i found that the tilde produced the same crash, I don't know if that helps, but a little more info.

[hdamron17]

What if you do something with a valid lever token? I think the issue is just that there's nothing after the macro name and so when it asserts that it's stripped whitespace off the definition, there's nothing left and it's confused.