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concat_bytes_expand_subtree

hir_expand::builtin::fn_macro

Function concat_bytes_expand_subtree 

Source 
fn concat_bytes_expand_subtree(
    tree_iter: TtIter<'_>,
    bytes: &mut String,
    record_span: impl FnMut(Span),
    err_span: Span,
) -> Result<(), ExpandError>