48 lines
1.8 KiB
Rust
48 lines
1.8 KiB
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_diagnostic, proc_macro_span, proc_macro_def_site)]
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extern crate proc_macro;
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use proc_macro::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree};
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use std::iter::FromIterator;
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#[proc_macro_attribute]
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pub fn repro(_args: TokenStream, input: TokenStream) -> TokenStream {
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let call_site = Span::call_site();
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let span = input.into_iter().nth(8).unwrap().span();
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//fn f(_: &::std::fmt::Formatter) {}
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TokenStream::from_iter([
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TokenTree::Ident(Ident::new("fn", call_site)),
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TokenTree::Ident(Ident::new("f", call_site)),
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TokenTree::Group(Group::new(
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Delimiter::Parenthesis,
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TokenStream::from_iter([
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TokenTree::Ident(Ident::new("_", call_site)),
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TokenTree::Punct(punct(':', Spacing::Alone, call_site)),
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TokenTree::Punct(punct('&', Spacing::Alone, call_site)),
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TokenTree::Punct(punct(':', Spacing::Joint, span)),
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TokenTree::Punct(punct(':', Spacing::Alone, span)),
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TokenTree::Ident(Ident::new("std", span)),
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TokenTree::Punct(punct(':', Spacing::Joint, span)),
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TokenTree::Punct(punct(':', Spacing::Alone, span)),
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TokenTree::Ident(Ident::new("fmt", span)),
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TokenTree::Punct(punct(':', Spacing::Joint, span)),
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TokenTree::Punct(punct(':', Spacing::Alone, span)),
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TokenTree::Ident(Ident::new("Formatter", span)),
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]),
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)),
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TokenTree::Group(Group::new(Delimiter::Brace, TokenStream::new())),
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])
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}
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fn punct(ch: char, spacing: Spacing, span: Span) -> Punct {
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let mut punct = Punct::new(ch, spacing);
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punct.set_span(span);
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punct
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}
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