1 files changed, 52 insertions, 6 deletions

diff --git a/vendor/clap_derive/src/utils/ty.rs b/vendor/clap_derive/src/utils/ty.rs
index 0bcb59f27..9349bc29d 100644
--- a/vendor/clap_derive/src/utils/ty.rs
+++ b/vendor/clap_derive/src/utils/ty.rs
@@ -7,12 +7,15 @@ use syn::{
     PathSegment, Type, TypePath,
 };
 
-#[derive(Copy, Clone, PartialEq, Debug)]
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
 pub enum Ty {
+    Unit,
     Vec,
+    VecVec,
     Option,
     OptionOption,
     OptionVec,
+    OptionVecVec,
     Other,
 }
 
@@ -21,13 +24,15 @@ impl Ty {
         use self::Ty::*;
         let t = |kind| Sp::new(kind, ty.span());
 
-        if is_generic_ty(ty, "Vec") {
-            t(Vec)
+        if is_unit_ty(ty) {
+            t(Unit)
+        } else if let Some(vt) = get_vec_ty(ty, Vec, VecVec) {
+            t(vt)
         } else if let Some(subty) = subty_if_name(ty, "Option") {
             if is_generic_ty(subty, "Option") {
                 t(OptionOption)
-            } else if is_generic_ty(subty, "Vec") {
-                t(OptionVec)
+            } else if let Some(vt) = get_vec_ty(subty, OptionVec, OptionVecVec) {
+                t(vt)
             } else {
                 t(Option)
             }
@@ -35,15 +40,32 @@ impl Ty {
             t(Other)
         }
     }
+
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            Self::Unit => "()",
+            Self::Vec => "Vec<T>",
+            Self::Option => "Option<T>",
+            Self::OptionOption => "Option<Option<T>>",
+            Self::OptionVec => "Option<Vec<T>>",
+            Self::VecVec => "Vec<Vec<T>>",
+            Self::OptionVecVec => "Option<Vec<Vec<T>>>",
+            Self::Other => "...other...",
+        }
+    }
 }
 
 pub fn inner_type(field_ty: &syn::Type) -> &syn::Type {
     let ty = Ty::from_syn_ty(field_ty);
     match *ty {
         Ty::Vec | Ty::Option => sub_type(field_ty).unwrap_or(field_ty),
-        Ty::OptionOption | Ty::OptionVec => {
+        Ty::OptionOption | Ty::OptionVec | Ty::VecVec => {
             sub_type(field_ty).and_then(sub_type).unwrap_or(field_ty)
         }
+        Ty::OptionVecVec => sub_type(field_ty)
+            .and_then(sub_type)
+            .and_then(sub_type)
+            .unwrap_or(field_ty),
         _ => field_ty,
     }
 }
@@ -111,9 +133,33 @@ fn is_generic_ty(ty: &syn::Type, name: &str) -> bool {
     subty_if_name(ty, name).is_some()
 }
 
+fn is_unit_ty(ty: &syn::Type) -> bool {
+    if let syn::Type::Tuple(tuple) = ty {
+        tuple.elems.is_empty()
+    } else {
+        false
+    }
+}
+
 fn only_one<I, T>(mut iter: I) -> Option<T>
 where
     I: Iterator<Item = T>,
 {
     iter.next().filter(|_| iter.next().is_none())
 }
+
+#[cfg(feature = "unstable-v5")]
+fn get_vec_ty(ty: &Type, vec_ty: Ty, vecvec_ty: Ty) -> Option<Ty> {
+    subty_if_name(ty, "Vec").map(|subty| {
+        if is_generic_ty(subty, "Vec") {
+            vecvec_ty
+        } else {
+            vec_ty
+        }
+    })
+}
+
+#[cfg(not(feature = "unstable-v5"))]
+fn get_vec_ty(ty: &Type, vec_ty: Ty, _vecvec_ty: Ty) -> Option<Ty> {
+    is_generic_ty(ty, "Vec").then_some(vec_ty)
+}