pub struct MacroExprHelper<'a> { /* private fields */ }
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impl<'a> Freeze for MacroExprHelper<'a>
impl<'a> RefUnwindSafe for MacroExprHelper<'a>
impl<'a> Send for MacroExprHelper<'a>
impl<'a> Sync for MacroExprHelper<'a>
impl<'a> Unpin for MacroExprHelper<'a>
impl<'a> !UnwindSafe for MacroExprHelper<'a>
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