pub const SUGAR: RustSugar;Expand description
JavaScript desugar config: C-family braces with // and /* */ comments.
newline_boundary is true so a top-level rust { ... } on its own line is
recognized — rust { is never valid JS otherwise, so this only ever matches
an intended FFI block. The desugar runs on raw source BEFORE lexing, so the
block is replaced in place by a __rust_compile(...) expression statement.