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< main > < div class = "width-limiter" > < nav class = "sub" > < form class = "search-form" > < span > < / span > < div id = "sidebar-button" tabindex = "-1" > < a href = "../syn/all.html" title = "show sidebar" > < / a > < / div > < input class = "search-input" name = "search" aria-label = "Run search in the documentation" autocomplete = "off" spellcheck = "false" placeholder = "Click or press ‘ ’ ‘ ’ type = "search" > < div id = "help-button" tabindex = "-1" > < a href = "../help.html" title = "help" > ?< / a > < / div > < div id = "settings-menu" tabindex = "-1" > < a href = "../settings.html" title = "settings" > < img width = "22" height = "22" alt = "Change settings" src = "../static.files/wheel-7b819b6101059cd0.svg" > < / a > < / div > < / form > < / nav > < section id = "main-content" class = "content" > < div class = "main-heading" > < h1 > Macro < a href = "index.html" > syn< / a > ::< wbr > < a class = "macro" href = "#" > parse_quote_spanned< / a > < button id = "copy-path" title = "Copy item path to clipboard" > < img src = "../static.files/clipboard-7571035ce49a181d.svg" width = "19" height = "18" alt = "Copy item path" > < / button > < / h1 > < span class = "out-of-band" > < a class = "src" href = "../src/syn/parse_quote.rs.html#101-105" > source< / a > · < button id = "toggle-all-docs" title = "collapse all docs" > [< span > − < / span > ]< / button > < / span > < / div > < pre class = "rust item-decl" > < span class = "macro" > macro_rules!< / span > parse_quote_spanned {
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(< span class = "macro-nonterminal" > $span< / span > :expr=> $(< span class = "macro-nonterminal" > $tt< / span > :tt)< span class = "kw-2" > *< / span > ) => { ... };
}< / pre > < details class = "toggle top-doc" open > < summary class = "hideme" > < span > Expand description< / span > < / summary > < div class = "docblock" > < p > This macro is < a href = "macro.parse_quote.html" title = "macro syn::parse_quote" > < code > parse_quote!< / code > < / a > + < a href = "../quote/macro.quote_spanned.html" title = "macro quote::quote_spanned" > < code > quote_spanned!< / code > < / a > .< / p >
< p > Please refer to each of their documentation.< / p >
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< h2 id = "example" > < a class = "doc-anchor" href = "#example" > §< / a > Example< / h2 >
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< div class = "example-wrap" > < pre class = "rust rust-example-rendered" > < code > < span class = "kw" > use < / span > quote::{quote, quote_spanned};
< span class = "kw" > use < / span > syn::spanned::Spanned;
< span class = "kw" > use < / span > syn::{parse_quote_spanned, ReturnType, Signature};
< span class = "comment" > // Changes `fn()` to `fn() -> Pin< Box< dyn Future< Output = ()> > > `,
// and `fn() -> T` to `fn() -> Pin< Box< dyn Future< Output = T> > > `,
// without introducing any call_site() spans.
< / span > < span class = "kw" > fn < / span > make_ret_pinned_future(sig: < span class = "kw-2" > & mut < / span > Signature) {
< span class = "kw" > let < / span > ret = < span class = "kw" > match < / span > < span class = "kw-2" > & < / span > sig.output {
ReturnType::Default => < span class = "macro" > quote_spanned!< / span > (sig.paren_token.span=> ()),
ReturnType::Type(< span class = "kw" > _< / span > , ret) => < span class = "macro" > quote!< / span > (#ret),
};
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sig.output = < span class = "macro" > parse_quote_spanned!< / span > {ret.span()=>
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-> ::std::pin::Pin< ::std::boxed::Box< < span class = "kw" > dyn < / span > ::std::future::Future< Output = #ret> > >
};
}< / code > < / pre > < / div >
< / div > < / details > < / section > < / div > < / main > < / body > < / html >
