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use rustc_ast::ptr::P;
use rustc_ast::tokenstream::{DelimSpan, TokenStream};
use rustc_ast::*;
use rustc_expand::base::*;
use rustc_span::symbol::sym;
use rustc_span::Span;
// 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.
pub fn expand_panic<'cx>(
cx: &'cx mut ExtCtxt<'_>,
sp: Span,
tts: TokenStream,
) -> Box<dyn MacResult + 'cx> {
let panic = if sp.rust_2021() { sym::panic_2021 } else { sym::panic_2015 };
let sp = cx.with_call_site_ctxt(sp);
MacEager::expr(
cx.expr(
sp,
ExprKind::MacCall(MacCall {
path: Path {
span: sp,
segments: cx
.std_path(&[sym::panic, panic])
.into_iter()
.map(|ident| PathSegment::from_ident(ident))
.collect(),
tokens: None,
},
args: P(MacArgs::Delimited(
DelimSpan::from_single(sp),
MacDelimiter::Parenthesis,
tts,
)),
prior_type_ascription: None,
}),
),
)
}
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