37 lines
925 B
Rust
37 lines
925 B
Rust
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// force-host
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// no-prefer-dynamic
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#![crate_type = "proc-macro"]
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#![feature(proc_macro_span, proc_macro_hygiene, proc_macro_quote)]
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extern crate proc_macro;
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use proc_macro::{quote, Span, TokenStream};
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fn assert_same_span(a: Span, b: Span) {
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assert_eq!(a.start(), b.start());
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assert_eq!(a.end(), b.end());
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}
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// This macro generates a macro with the same macro definition as `manual_foo` in
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// `same-sequence-span.rs` but with the same span for all sequences.
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#[proc_macro]
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pub fn make_foo(_: TokenStream) -> TokenStream {
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let result = quote! {
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macro_rules! generated_foo {
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(1 $$x:expr $$($$y:tt,)* $$(= $$z:tt)*) => {};
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}
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};
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// Check that all spans are equal.
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let mut span = None;
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for tt in result.clone() {
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match span {
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None => span = Some(tt.span()),
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Some(span) => assert_same_span(tt.span(), span),
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}
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}
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result
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}
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