Function expand_panic

pub(crate) fn expand_panic<'cx>(
    cx: &'cx mut ExtCtxt<'_>,
    sp: Span,
    tts: TokenStream,
) -> MacroExpanderResult<'cx>

This expands to either

• $crate::panic::panic_2015!(...) or
• $crate::panic::panic_2021!(...) depending on the edition.

This is used for both std::panic!() and core::panic!().

$crate will refer to either the std or core crate depending on which one we’re expanding from.