Use Ident::new_raw when it's available

[mystor]

The Ident::new_raw method has been stable since rustc 1.47.0 (https://doc.rust-lang.org/nightly/proc_macro/struct.Ident.html#method.new_raw). The logic for pushing raw identifiers into a TokenStream still uses TokenStream::from_str however, and could be updated to call this new_raw on versions where it's available.

quote/src/runtime.rs

Lines 192 to 202 in 7d5d360

	pub fn push_ident(tokens: &mut TokenStream, s: &str) {
	// Optimization over `mk_ident`, as `s` is guaranteed to be a valid ident.
	//
	// FIXME: When `Ident::new_raw` becomes stable, this method should be
	// updated to call it when available.
	if s.starts_with("r#") {
	parse(tokens, s);
	} else {
	tokens.append(Ident::new(s, Span::call_site()));
	}
	}

quote/src/runtime.rs

Lines 204 to 214 in 7d5d360

	pub fn push_ident_spanned(tokens: &mut TokenStream, span: Span, s: &str) {
	// Optimization over `mk_ident`, as `s` is guaranteed to be a valid ident.
	//
	// FIXME: When `Ident::new_raw` becomes stable, this method should be
	// updated to call it when available.
	if s.starts_with("r#") {
	parse_spanned(tokens, span, s);
	} else {
	tokens.append(Ident::new(s, span));
	}
	}

quote/src/runtime.rs

Lines 322 to 335 in 7d5d360

	// At this point, the identifier is raw, and the unraw-ed version of it was
	// successfully converted into an identifier. Try to produce a valid raw
	// identifier by running the `TokenStream` parser, and unwrapping the first
	// token as an `Ident`.
	//
	// FIXME: When `Ident::new_raw` becomes stable, this method should be
	// updated to call it when available.
	if let Ok(ts) = id.parse::<TokenStream>() {
	let mut iter = ts.into_iter();
	if let (Some(TokenTree::Ident(mut id)), None) = (iter.next(), iter.next()) {
	id.set_span(span);
	return id;
	}
	}