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| 1 | +// force-host |
| 2 | +// no-prefer-dynamic |
| 3 | + |
| 4 | +#![crate_type = "proc-macro"] |
| 5 | + |
| 6 | +//#![feature(proc_macro_diagnostic, proc_macro_span, proc_macro_def_site)] |
| 7 | + |
| 8 | +extern crate proc_macro; |
| 9 | + |
| 10 | +use proc_macro::{Delimiter, Group, Ident, Punct, Spacing, Span, TokenStream, TokenTree}; |
| 11 | +use std::iter::FromIterator; |
| 12 | + |
| 13 | +#[proc_macro_attribute] |
| 14 | +pub fn repro(_args: TokenStream, input: TokenStream) -> TokenStream { |
| 15 | + let call_site = Span::call_site(); |
| 16 | + let span = input.into_iter().nth(8).unwrap().span(); |
| 17 | + |
| 18 | + //fn f(_: &::std::fmt::Formatter) {} |
| 19 | + TokenStream::from_iter([ |
| 20 | + TokenTree::Ident(Ident::new("fn", call_site)), |
| 21 | + TokenTree::Ident(Ident::new("f", call_site)), |
| 22 | + TokenTree::Group(Group::new( |
| 23 | + Delimiter::Parenthesis, |
| 24 | + TokenStream::from_iter([ |
| 25 | + TokenTree::Ident(Ident::new("_", call_site)), |
| 26 | + TokenTree::Punct(punct(':', Spacing::Alone, call_site)), |
| 27 | + TokenTree::Punct(punct('&', Spacing::Alone, call_site)), |
| 28 | + TokenTree::Punct(punct(':', Spacing::Joint, span)), |
| 29 | + TokenTree::Punct(punct(':', Spacing::Alone, span)), |
| 30 | + TokenTree::Ident(Ident::new("std", span)), |
| 31 | + TokenTree::Punct(punct(':', Spacing::Joint, span)), |
| 32 | + TokenTree::Punct(punct(':', Spacing::Alone, span)), |
| 33 | + TokenTree::Ident(Ident::new("fmt", span)), |
| 34 | + TokenTree::Punct(punct(':', Spacing::Joint, span)), |
| 35 | + TokenTree::Punct(punct(':', Spacing::Alone, span)), |
| 36 | + TokenTree::Ident(Ident::new("Formatter", span)), |
| 37 | + ]), |
| 38 | + )), |
| 39 | + TokenTree::Group(Group::new(Delimiter::Brace, TokenStream::new())), |
| 40 | + ]) |
| 41 | +} |
| 42 | + |
| 43 | +fn punct(ch: char, spacing: Spacing, span: Span) -> Punct { |
| 44 | + let mut punct = Punct::new(ch, spacing); |
| 45 | + punct.set_span(span); |
| 46 | + punct |
| 47 | +} |
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