map $ g$ gets lexer error

[errael]

vim9script
map $ g$

thread 'main' panicked at 'not yet implemented: Ok(1,4): ' '', crates/vim9-lexer/src/lib.rs:982:23
stack backtrace:
   0: rust_begin_unwind
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/std/src/panicking.rs:593:5
   1: core::panicking::panic_fmt
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/panicking.rs:67:14
   2: vim9_lexer::Lexer::handle_dollar
             at /src/tools/vim9jit/crates/vim9-lexer/src/lib.rs:982:23
   3: vim9_lexer::Lexer::next_token
             at /src/tools/vim9jit/crates/vim9-lexer/src/lib.rs:772:28
   4: vim9_parser::Parser::fill_buffer
             at /src/tools/vim9jit/crates/vim9-parser/src/lib.rs:2421:29
   5: vim9_parser::Parser::pop
             at /src/tools/vim9jit/crates/vim9-parser/src/lib.rs:1971:13
   6: vim9_parser::Parser::expect_eol
             at /src/tools/vim9jit/crates/vim9-parser/src/lib.rs:2270:16
   7: vim9_parser::Vim9ScriptCommand::parse
             at /src/tools/vim9jit/crates/vim9-parser/src/lib.rs:189:18
   8: vim9_parser::Parser::parse_command
             at /src/tools/vim9jit/crates/vim9-parser/src/lib.rs:2488:43
   9: vim9_parser::Parser::parse_program
             at /src/tools/vim9jit/crates/vim9-parser/src/lib.rs:2589:33
  10: vim9_gen::generate
             at /src/tools/vim9jit/crates/vim9-gen/src/lib.rs:1759:19
  11: vim9jit::main
             at /src/tools/vim9jit/src/main.rs:107:31
  12: core::ops::function::FnOnce::call_once
             at /rustc/5680fa18feaa87f3ff04063800aec256c3d4b4be/library/core/src/ops/function.rs:250:5