Work around overflow evaluating the requirement in Nightly rustdoc
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In current Nightly, `cargo doc` fails with the error message below. The fix in rustdoc is at the “investigating the feasibility” stage. See rust-lang/rust#62132 and rust-lang/rust#62059 ```rust error[E0275]: overflow evaluating the requirement `proc_macro2::Group: std::marker::Unpin` | = help: consider adding a `#![recursion_limit="128"]` attribute to your crate = note: required because it appears within the type `proc_macro2::TokenTree` = note: required because it appears within the type `*const proc_macro2::TokenTree` = note: required because it appears within the type `std::ptr::Unique<proc_macro2::TokenTree>` = note: required because it appears within the type `alloc::raw_vec::RawVec<proc_macro2::TokenTree>` = note: required because it appears within the type `std::vec::Vec<proc_macro2::TokenTree>` = note: required because it appears within the type `proc_macro2::fallback::TokenStream` = note: required because it appears within the type `proc_macro2::imp::TokenStream` = note: required because it appears within the type `proc_macro2::TokenStream` = note: required because it appears within the type `syn::Macro` = note: required because it appears within the type `syn::PatMacro` = note: required because it appears within the type `syn::Pat` = note: required because it appears within the type `(syn::Pat, syn::token::Or)` = note: required because it appears within the type `*const (syn::Pat, syn::token::Or)` = note: required because it appears within the type `std::ptr::Unique<(syn::Pat, syn::token::Or)>` = note: required because it appears within the type `alloc::raw_vec::RawVec<(syn::Pat, syn::token::Or)>` = note: required because it appears within the type `std::vec::Vec<(syn::Pat, syn::token::Or)>` = note: required because it appears within the type `syn::punctuated::Punctuated<syn::Pat, syn::token::Or>` = note: required because it appears within the type `syn::ExprLet` = note: required because it appears within the type `syn::Expr` = note: required because it appears within the type `syn::TypeArray` = note: required because it appears within the type `syn::Type` = note: required because it appears within the type `syn::GenericArgument` = note: required because it appears within the type `(syn::GenericArgument, syn::token::Comma)` = note: required because it appears within the type `*const (syn::GenericArgument, syn::token::Comma)` = note: required because it appears within the type `std::ptr::Unique<(syn::GenericArgument, syn::token::Comma)>` = note: required because it appears within the type `alloc::raw_vec::RawVec<(syn::GenericArgument, syn::token::Comma)>` = note: required because it appears within the type `std::vec::Vec<(syn::GenericArgument, syn::token::Comma)>` = note: required because it appears within the type `syn::punctuated::Punctuated<syn::GenericArgument, syn::token::Comma>` = note: required because it appears within the type `syn::AngleBracketedGenericArguments` = note: required because it appears within the type `syn::PathArguments` = note: required because it appears within the type `syn::PathSegment` = note: required because it appears within the type `(syn::PathSegment, syn::token::Colon2)` = note: required because it appears within the type `*const (syn::PathSegment, syn::token::Colon2)` = note: required because it appears within the type `std::ptr::Unique<(syn::PathSegment, syn::token::Colon2)>` = note: required because it appears within the type `alloc::raw_vec::RawVec<(syn::PathSegment, syn::token::Colon2)>` = note: required because it appears within the type `std::vec::Vec<(syn::PathSegment, syn::token::Colon2)>` = note: required because it appears within the type `syn::punctuated::Punctuated<syn::PathSegment, syn::token::Colon2>` = note: required because it appears within the type `syn::Path` = note: required because it appears within the type `syn::Attribute` = note: required because it appears within the type `*const syn::Attribute` = note: required because it appears within the type `std::ptr::Unique<syn::Attribute>` = note: required because it appears within the type `alloc::raw_vec::RawVec<syn::Attribute>` = note: required because it appears within the type `std::vec::Vec<syn::Attribute>` = note: required because it appears within the type `syn::LifetimeDef` = note: required because it appears within the type `(syn::LifetimeDef, syn::token::Comma)` = note: required because it appears within the type `*const (syn::LifetimeDef, syn::token::Comma)` = note: required because it appears within the type `std::ptr::Unique<(syn::LifetimeDef, syn::token::Comma)>` = note: required because it appears within the type `alloc::raw_vec::RawVec<(syn::LifetimeDef, syn::token::Comma)>` = note: required because it appears within the type `std::vec::Vec<(syn::LifetimeDef, syn::token::Comma)>` = note: required because it appears within the type `syn::punctuated::Punctuated<syn::LifetimeDef, syn::token::Comma>` = note: required because it appears within the type `syn::BoundLifetimes` = note: required because it appears within the type `std::option::Option<syn::BoundLifetimes>` = note: required because it appears within the type `syn::PredicateType` = note: required because it appears within the type `syn::WherePredicate` = note: required because it appears within the type `*const syn::WherePredicate` = note: required because it appears within the type `std::ptr::Unique<syn::WherePredicate>` = note: required because it appears within the type `alloc::raw_vec::RawVec<syn::WherePredicate>` = note: required because it appears within the type `std::vec::Vec<syn::WherePredicate>` = note: required because it appears within the type `std::option::Option<std::vec::Vec<syn::WherePredicate>>` = note: required because it appears within the type `attr::InputClone` = note: required because it appears within the type `std::option::Option<attr::InputClone>` = note: required because it appears within the type `attr::Input` = note: required because it appears within the type `ast::Input<'a>` error: aborting due to previous error For more information about this error, try `rustc --explain E0275`. error: Could not document `derivative`. ```
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Sorry for the noise, I found another work-around (a |
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In current Nightly,
cargo docfails with the error message below. The fix in rustdoc is at the “investigating the feasibility” stage.See rust-lang/rust#62132 and rust-lang/rust#62059