a8086cf9df
This reverts commit e6c02aad93.
Keeps the code improvements from the PR and the test (as a known-bug).
53 lines
1.6 KiB
Rust
53 lines
1.6 KiB
Rust
// force-host
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// no-prefer-dynamic
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#![crate_type = "proc-macro"]
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extern crate proc_macro;
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use proc_macro::{Delimiter, Group, Ident, Literal, Punct, Spacing, Span, TokenStream, TokenTree};
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use std::iter::FromIterator;
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#[proc_macro]
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pub fn foo_with_input_span(input: TokenStream) -> TokenStream {
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let span = input.into_iter().next().unwrap().span();
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let mut lit = Literal::string("{foo}");
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lit.set_span(span);
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TokenStream::from(TokenTree::Literal(lit))
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}
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#[proc_macro]
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pub fn err_with_input_span(input: TokenStream) -> TokenStream {
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let span = input.into_iter().next().unwrap().span();
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let mut lit = Literal::string(" }");
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lit.set_span(span);
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TokenStream::from(TokenTree::Literal(lit))
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}
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#[proc_macro]
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pub fn respan_to_invalid_format_literal(input: TokenStream) -> TokenStream {
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let mut s = Literal::string("{");
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s.set_span(input.into_iter().next().unwrap().span());
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TokenStream::from_iter([
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TokenTree::from(Ident::new("format", Span::call_site())),
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TokenTree::from(Punct::new('!', Spacing::Alone)),
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TokenTree::from(Group::new(Delimiter::Parenthesis, TokenTree::from(s).into())),
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])
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}
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#[proc_macro]
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pub fn capture_a_with_prepended_space_preserve_span(input: TokenStream) -> TokenStream {
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let mut s = Literal::string(" {a}");
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s.set_span(input.into_iter().next().unwrap().span());
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TokenStream::from_iter([
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TokenTree::from(Ident::new("format", Span::call_site())),
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TokenTree::from(Punct::new('!', Spacing::Alone)),
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TokenTree::from(Group::new(Delimiter::Parenthesis, TokenTree::from(s).into())),
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])
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}
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