fix(clap_derive): Unwrap syn::TypeGroup when checking field types
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Due to macro expansions, a `syn` type may be wrapped in multiple 'layers' of `syn::Type::Group`. However, `clap_derive` currently does not check for `syn::Type::Group`, which will cause an `Option` (along with other matched types) to fail to be detected when it results from a macro expansion. This commit 'unwraps' outer type groups before checking the user-provided types against well-known types. Currently, these groups may not be present due to a rustc bug (rust-lang/rust#43081) However, once rust-lang/rust#73084 is merged, these groups will be present in more cases. This commit makes `clap` compatible with both older and newer versions of rustc.
Aaron1011
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bors r+ Thank you, @Aaron1011 ! |
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Build succeeded: |
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@CreepySkeleton: Could you make a new point release? That will make it easy for any crates broken by rust-lang/rust#73084 to keep compiling. |
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This branch is still in beta, we can't do a patch release. |
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@pksunkara Why exactly we can't have a new |
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Due to macro expansions, a
syntype may be wrapped in multiple'layers' of
syn::Type::Group. However,clap_derivecurrently doesnot check for
syn::Type::Group, which will cause anOption(alongwith other matched types) to fail to be detected when it results from a
macro expansion.
This commit 'unwraps' outer type groups before checking the
user-provided types against well-known types. Currently, these groups
may not be present due to a rustc bug (rust-lang/rust#43081)
However, once rust-lang/rust#73084 is merged,
these groups will be present in more cases. This commit makes
clapcompatible with both older and newer versions of rustc.