diff --git a/clap_derive/tests/arg_enum.rs b/clap_derive/tests/arg_enum.rs
index 4ca646c6..809734ed 100644
--- a/clap_derive/tests/arg_enum.rs
+++ b/clap_derive/tests/arg_enum.rs
@@ -297,7 +297,41 @@ fn multiple_alias() {
 }
 
 #[test]
-fn option() {
+fn skip_variant() {
+    #[derive(ArgEnum, PartialEq, Debug, Clone)]
+    #[allow(dead_code)] // silence warning about `Baz` being unused
+    enum ArgChoice {
+        Foo,
+        Bar,
+        #[clap(skip)]
+        Baz,
+    }
+
+    assert_eq!(
+        ArgChoice::value_variants()
+            .iter()
+            .map(ArgEnum::to_possible_value)
+            .map(Option::unwrap)
+            .collect::<Vec<_>>(),
+        vec![PossibleValue::new("foo"), PossibleValue::new("bar")]
+    );
+    assert!(ArgChoice::from_str("foo", true).is_ok());
+    assert!(ArgChoice::from_str("bar", true).is_ok());
+    assert!(ArgChoice::from_str("baz", true).is_err());
+}
+
+#[test]
+fn from_str_invalid() {
+    #[derive(ArgEnum, PartialEq, Debug, Clone)]
+    enum ArgChoice {
+        Foo,
+    }
+
+    assert!(ArgChoice::from_str("bar", true).is_err());
+}
+
+#[test]
+fn option_type() {
     #[derive(ArgEnum, PartialEq, Debug, Clone)]
     enum ArgChoice {
         Foo,
@@ -327,7 +361,7 @@ fn option() {
 }
 
 #[test]
-fn option_option() {
+fn option_option_type() {
     #[derive(ArgEnum, PartialEq, Debug, Clone)]
     enum ArgChoice {
         Foo,
@@ -361,7 +395,7 @@ fn option_option() {
 }
 
 #[test]
-fn vector() {
+fn vec_type() {
     #[derive(ArgEnum, PartialEq, Debug, Clone)]
     enum ArgChoice {
         Foo,
@@ -391,7 +425,7 @@ fn vector() {
 }
 
 #[test]
-fn option_vector() {
+fn option_vec_type() {
     #[derive(ArgEnum, PartialEq, Debug, Clone)]
     enum ArgChoice {
         Foo,
@@ -423,37 +457,3 @@ fn option_vector() {
     );
     assert!(Opt::try_parse_from(&["", "-a", "fOo"]).is_err());
 }
-
-#[test]
-fn skip_variant() {
-    #[derive(ArgEnum, PartialEq, Debug, Clone)]
-    #[allow(dead_code)] // silence warning about `Baz` being unused
-    enum ArgChoice {
-        Foo,
-        Bar,
-        #[clap(skip)]
-        Baz,
-    }
-
-    assert_eq!(
-        ArgChoice::value_variants()
-            .iter()
-            .map(ArgEnum::to_possible_value)
-            .map(Option::unwrap)
-            .collect::<Vec<_>>(),
-        vec![PossibleValue::new("foo"), PossibleValue::new("bar")]
-    );
-    assert!(ArgChoice::from_str("foo", true).is_ok());
-    assert!(ArgChoice::from_str("bar", true).is_ok());
-    assert!(ArgChoice::from_str("baz", true).is_err());
-}
-
-#[test]
-fn from_str_invalid() {
-    #[derive(ArgEnum, PartialEq, Debug, Clone)]
-    enum ArgChoice {
-        Foo,
-    }
-
-    assert!(ArgChoice::from_str("bar", true).is_err());
-}
diff --git a/clap_derive/tests/arguments.rs b/clap_derive/tests/arguments.rs
index e08b624c..2a1b0d11 100644
--- a/clap_derive/tests/arguments.rs
+++ b/clap_derive/tests/arguments.rs
@@ -29,20 +29,6 @@ fn required_argument() {
     assert!(Opt::try_parse_from(&["test", "42", "24"]).is_err());
 }
 
-#[test]
-fn optional_argument() {
-    #[derive(Parser, PartialEq, Debug)]
-    struct Opt {
-        arg: Option<i32>,
-    }
-    assert_eq!(
-        Opt { arg: Some(42) },
-        Opt::try_parse_from(&["test", "42"]).unwrap()
-    );
-    assert_eq!(Opt { arg: None }, Opt::try_parse_from(&["test"]).unwrap());
-    assert!(Opt::try_parse_from(&["test", "42", "24"]).is_err());
-}
-
 #[test]
 fn argument_with_default() {
     #[derive(Parser, PartialEq, Debug)]
@@ -58,45 +44,6 @@ fn argument_with_default() {
     assert!(Opt::try_parse_from(&["test", "42", "24"]).is_err());
 }
 
-#[test]
-fn arguments() {
-    #[derive(Parser, PartialEq, Debug)]
-    struct Opt {
-        arg: Vec<i32>,
-    }
-    assert_eq!(
-        Opt { arg: vec![24] },
-        Opt::try_parse_from(&["test", "24"]).unwrap()
-    );
-    assert_eq!(Opt { arg: vec![] }, Opt::try_parse_from(&["test"]).unwrap());
-    assert_eq!(
-        Opt { arg: vec![24, 42] },
-        Opt::try_parse_from(&["test", "24", "42"]).unwrap()
-    );
-}
-
-#[test]
-fn arguments_safe() {
-    #[derive(Parser, PartialEq, Debug)]
-    struct Opt {
-        arg: Vec<i32>,
-    }
-    assert_eq!(
-        Opt { arg: vec![24] },
-        Opt::try_parse_from(&["test", "24"]).unwrap()
-    );
-    assert_eq!(Opt { arg: vec![] }, Opt::try_parse_from(&["test"]).unwrap());
-    assert_eq!(
-        Opt { arg: vec![24, 42] },
-        Opt::try_parse_from(&["test", "24", "42"]).unwrap()
-    );
-
-    assert_eq!(
-        clap::ErrorKind::ValueValidation,
-        Opt::try_parse_from(&["test", "NOPE"]).err().unwrap().kind
-    );
-}
-
 #[test]
 fn auto_value_name() {
     #[derive(Parser, PartialEq, Debug)]
@@ -136,3 +83,38 @@ fn explicit_value_name() {
         Opt::try_parse_from(&["test", "10"]).unwrap()
     );
 }
+
+#[test]
+fn option_type_is_optional() {
+    #[derive(Parser, PartialEq, Debug)]
+    struct Opt {
+        arg: Option<i32>,
+    }
+    assert_eq!(
+        Opt { arg: Some(42) },
+        Opt::try_parse_from(&["test", "42"]).unwrap()
+    );
+    assert_eq!(Opt { arg: None }, Opt::try_parse_from(&["test"]).unwrap());
+    assert!(Opt::try_parse_from(&["test", "42", "24"]).is_err());
+}
+
+#[test]
+fn vec_type_is_multiple_values() {
+    #[derive(Parser, PartialEq, Debug)]
+    struct Opt {
+        arg: Vec<i32>,
+    }
+    assert_eq!(
+        Opt { arg: vec![24] },
+        Opt::try_parse_from(&["test", "24"]).unwrap()
+    );
+    assert_eq!(Opt { arg: vec![] }, Opt::try_parse_from(&["test"]).unwrap());
+    assert_eq!(
+        Opt { arg: vec![24, 42] },
+        Opt::try_parse_from(&["test", "24", "42"]).unwrap()
+    );
+    assert_eq!(
+        clap::ErrorKind::ValueValidation,
+        Opt::try_parse_from(&["test", "NOPE"]).err().unwrap().kind
+    );
+}
diff --git a/clap_derive/tests/basic.rs b/clap_derive/tests/basic.rs
index 69f7ee29..917fa6dd 100644
--- a/clap_derive/tests/basic.rs
+++ b/clap_derive/tests/basic.rs
@@ -19,17 +19,12 @@ fn basic() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
         #[clap(short = 'a', long = "arg")]
-        arg: Vec<i32>,
+        arg: i32,
     }
     assert_eq!(
-        Opt { arg: vec![24] },
+        Opt { arg: 24 },
         Opt::try_parse_from(&["test", "-a24"]).unwrap()
     );
-    assert_eq!(Opt { arg: vec![] }, Opt::try_parse_from(&["test"]).unwrap());
-    assert_eq!(
-        Opt { arg: vec![24, 42] },
-        Opt::try_parse_from(&["test", "--arg", "24", "42"]).unwrap()
-    );
 }
 
 #[test]
diff --git a/clap_derive/tests/doc-comments-help.rs b/clap_derive/tests/doc-comments-help.rs
index 1d6b0c24..d502a2b6 100644
--- a/clap_derive/tests/doc-comments-help.rs
+++ b/clap_derive/tests/doc-comments-help.rs
@@ -108,7 +108,7 @@ fn top_long_doc_comment_both_help_long_help() {
         /// Or something else
         Foo {
             #[clap(about = "foo")]
-            bars: Vec<String>,
+            bars: String,
         },
     }
 
diff --git a/clap_derive/tests/explicit_name_no_renaming.rs b/clap_derive/tests/explicit_name_no_renaming.rs
index 8ea9955a..477fea2a 100644
--- a/clap_derive/tests/explicit_name_no_renaming.rs
+++ b/clap_derive/tests/explicit_name_no_renaming.rs
@@ -7,15 +7,20 @@ use utils::*;
 fn explicit_short_long_no_rename() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
-        #[clap(short = '.', long = ".foo", multiple_occurrences(true))]
-        foo: Vec<String>,
+        #[clap(short = '.', long = ".foo")]
+        foo: String,
     }
 
+    assert_eq!(
+        Opt { foo: "long".into() },
+        Opt::try_parse_from(&["test", "--.foo", "long"]).unwrap()
+    );
+
     assert_eq!(
         Opt {
-            foo: vec!["short".into(), "long".into()]
+            foo: "short".into(),
         },
-        Opt::try_parse_from(&["test", "-.", "short", "--.foo", "long"]).unwrap()
+        Opt::try_parse_from(&["test", "-.", "short"]).unwrap()
     );
 }
 
@@ -24,9 +29,9 @@ fn explicit_name_no_rename() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
         #[clap(name = ".options")]
-        foo: Vec<String>,
+        foo: String,
     }
 
     let help = get_long_help::<Opt>();
-    assert!(help.contains("[.options]..."))
+    assert!(help.contains("<.options>"))
 }
diff --git a/clap_derive/tests/flags.rs b/clap_derive/tests/flags.rs
index 9c57683a..176c6369 100644
--- a/clap_derive/tests/flags.rs
+++ b/clap_derive/tests/flags.rs
@@ -15,7 +15,7 @@
 use clap::Parser;
 
 #[test]
-fn unique_flag() {
+fn bool_type_is_flag() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
         #[clap(short, long)]
@@ -41,7 +41,7 @@ fn unique_flag() {
 }
 
 #[test]
-fn multiple_flag() {
+fn from_occurrences() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
         #[clap(short, long, parse(from_occurrences))]
@@ -74,12 +74,12 @@ fn multiple_flag() {
     assert!(Opt::try_parse_from(&["test", "-a", "foo"]).is_err());
 }
 
-fn parse_from_flag(b: bool) -> std::sync::atomic::AtomicBool {
-    std::sync::atomic::AtomicBool::new(b)
-}
-
 #[test]
-fn non_bool_flags() {
+fn non_bool_type_flag() {
+    fn parse_from_flag(b: bool) -> std::sync::atomic::AtomicBool {
+        std::sync::atomic::AtomicBool::new(b)
+    }
+
     #[derive(Parser, Debug)]
     struct Opt {
         #[clap(short, long, parse(from_flag = parse_from_flag))]
@@ -106,7 +106,7 @@ fn non_bool_flags() {
 }
 
 #[test]
-fn combined_flags() {
+fn mixed_type_flags() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
         #[clap(short, long)]
@@ -158,3 +158,32 @@ fn combined_flags() {
         Opt::try_parse_from(&["test", "-bb", "-a", "-bb"]).unwrap()
     );
 }
+
+#[test]
+fn ignore_qualified_bool_type() {
+    mod inner {
+        #[allow(non_camel_case_types)]
+        #[derive(PartialEq, Debug)]
+        pub struct bool(pub String);
+
+        impl std::str::FromStr for self::bool {
+            type Err = String;
+
+            fn from_str(s: &str) -> Result<Self, Self::Err> {
+                Ok(self::bool(s.into()))
+            }
+        }
+    }
+
+    #[derive(Parser, PartialEq, Debug)]
+    struct Opt {
+        arg: inner::bool,
+    }
+
+    assert_eq!(
+        Opt {
+            arg: inner::bool("success".into())
+        },
+        Opt::try_parse_from(&["test", "success"]).unwrap()
+    );
+}
diff --git a/clap_derive/tests/help.rs b/clap_derive/tests/help.rs
index b14a3722..48de6301 100644
--- a/clap_derive/tests/help.rs
+++ b/clap_derive/tests/help.rs
@@ -6,10 +6,10 @@ fn arg_help_heading_applied() {
     struct CliOptions {
         #[clap(long)]
         #[clap(help_heading = Some("HEADING A"))]
-        should_be_in_section_a: Option<u32>,
+        should_be_in_section_a: u32,
 
         #[clap(long)]
-        no_section: Option<u32>,
+        no_section: u32,
     }
 
     let app = CliOptions::into_app();
@@ -34,10 +34,10 @@ fn app_help_heading_applied() {
     struct CliOptions {
         #[clap(long)]
         #[clap(help_heading = Some("HEADING A"))]
-        should_be_in_section_a: Option<u32>,
+        should_be_in_section_a: u32,
 
         #[clap(long)]
-        should_be_in_default_section: Option<u32>,
+        should_be_in_default_section: u32,
     }
 
     let app = CliOptions::into_app();
@@ -72,21 +72,21 @@ fn app_help_heading_flattened() {
         sub_a: SubA,
 
         #[clap(long)]
-        should_be_in_default_section: Option<u32>,
+        should_be_in_default_section: u32,
     }
 
     #[derive(Debug, Clone, Args)]
     #[clap(help_heading = "HEADING A")]
     struct OptionsA {
         #[clap(long)]
-        should_be_in_section_a: Option<u32>,
+        should_be_in_section_a: u32,
     }
 
     #[derive(Debug, Clone, Args)]
     #[clap(help_heading = "HEADING B")]
     struct OptionsB {
         #[clap(long)]
-        should_be_in_section_b: Option<u32>,
+        should_be_in_section_b: u32,
     }
 
     #[derive(Debug, Clone, Subcommand)]
@@ -98,20 +98,20 @@ fn app_help_heading_flattened() {
         SubAOne,
         #[clap(help_heading = "SUB A")]
         SubATwo {
-            should_be_in_sub_a: Option<u32>,
+            should_be_in_sub_a: u32,
         },
     }
 
     #[derive(Debug, Clone, Subcommand)]
     enum SubB {
         #[clap(help_heading = "SUB B")]
-        SubBOne { should_be_in_sub_b: Option<u32> },
+        SubBOne { should_be_in_sub_b: u32 },
     }
 
     #[derive(Debug, Clone, Subcommand)]
     enum SubC {
         #[clap(help_heading = "SUB C")]
-        SubCOne { should_be_in_sub_c: Option<u32> },
+        SubCOne { should_be_in_sub_c: u32 },
     }
 
     let app = CliOptions::into_app();
@@ -172,7 +172,7 @@ fn flatten_field_with_help_heading() {
     #[derive(Debug, Clone, Args)]
     struct OptionsA {
         #[clap(long)]
-        should_be_in_section_a: Option<u32>,
+        should_be_in_section_a: u32,
     }
 
     let app = CliOptions::into_app();
diff --git a/clap_derive/tests/issues.rs b/clap_derive/tests/issues.rs
index 1e4730c4..4201cd42 100644
--- a/clap_derive/tests/issues.rs
+++ b/clap_derive/tests/issues.rs
@@ -63,7 +63,7 @@ fn issue_324() {
     #[clap(version = my_version())]
     struct Opt {
         #[clap(subcommand)]
-        _cmd: Option<SubCommand>,
+        _cmd: SubCommand,
     }
 
     #[derive(Subcommand)]
diff --git a/clap_derive/tests/nested.rs b/clap_derive/tests/macros.rs
similarity index 100%
rename from clap_derive/tests/nested.rs
rename to clap_derive/tests/macros.rs
diff --git a/clap_derive/tests/options.rs b/clap_derive/tests/options.rs
index 9d62ff8e..3ee40d2c 100644
--- a/clap_derive/tests/options.rs
+++ b/clap_derive/tests/options.rs
@@ -42,21 +42,6 @@ fn required_option() {
     assert!(Opt::try_parse_from(&["test", "-a42", "-a24"]).is_err());
 }
 
-#[test]
-fn optional_option() {
-    #[derive(Parser, PartialEq, Debug)]
-    struct Opt {
-        #[clap(short)]
-        arg: Option<i32>,
-    }
-    assert_eq!(
-        Opt { arg: Some(42) },
-        Opt::try_parse_from(&["test", "-a42"]).unwrap()
-    );
-    assert_eq!(Opt { arg: None }, Opt::try_parse_from(&["test"]).unwrap());
-    assert!(Opt::try_parse_from(&["test", "-a42", "-a24"]).is_err());
-}
-
 #[test]
 fn option_with_default() {
     #[derive(Parser, PartialEq, Debug)]
@@ -87,41 +72,6 @@ fn option_with_raw_default() {
     assert!(Opt::try_parse_from(&["test", "-a42", "-a24"]).is_err());
 }
 
-#[test]
-fn options() {
-    #[derive(Parser, PartialEq, Debug)]
-    struct Opt {
-        #[clap(short, long, multiple_occurrences(true))]
-        arg: Vec<i32>,
-    }
-    assert_eq!(
-        Opt { arg: vec![24] },
-        Opt::try_parse_from(&["test", "-a24"]).unwrap()
-    );
-    assert_eq!(Opt { arg: vec![] }, Opt::try_parse_from(&["test"]).unwrap());
-    assert_eq!(
-        Opt { arg: vec![24, 42] },
-        Opt::try_parse_from(&["test", "-a24", "--arg", "42"]).unwrap()
-    );
-}
-
-#[test]
-fn default_value() {
-    #[derive(Parser, PartialEq, Debug)]
-    struct Opt {
-        #[clap(short, default_value = "test")]
-        arg: String,
-    }
-    assert_eq!(
-        Opt { arg: "test".into() },
-        Opt::try_parse_from(&["test"]).unwrap()
-    );
-    assert_eq!(
-        Opt { arg: "foo".into() },
-        Opt::try_parse_from(&["test", "-afoo"]).unwrap()
-    );
-}
-
 #[test]
 fn option_from_str() {
     #[derive(Debug, PartialEq)]
@@ -147,7 +97,81 @@ fn option_from_str() {
 }
 
 #[test]
-fn optional_argument_for_optional_option() {
+fn option_type_is_optional() {
+    #[derive(Parser, PartialEq, Debug)]
+    struct Opt {
+        #[clap(short)]
+        arg: Option<i32>,
+    }
+    assert_eq!(
+        Opt { arg: Some(42) },
+        Opt::try_parse_from(&["test", "-a42"]).unwrap()
+    );
+    assert_eq!(Opt { arg: None }, Opt::try_parse_from(&["test"]).unwrap());
+    assert!(Opt::try_parse_from(&["test", "-a42", "-a24"]).is_err());
+}
+
+#[test]
+fn required_with_option_type() {
+    #[derive(Debug, PartialEq, Eq, Parser)]
+    #[clap(setting(clap::AppSettings::SubcommandsNegateReqs))]
+    struct Opt {
+        #[clap(required = true)]
+        req_str: Option<String>,
+
+        #[clap(subcommand)]
+        cmd: Option<SubCommands>,
+    }
+
+    #[derive(Debug, PartialEq, Eq, Subcommand)]
+    enum SubCommands {
+        ExSub {
+            #[clap(short, long, parse(from_occurrences))]
+            verbose: u8,
+        },
+    }
+
+    assert_eq!(
+        Opt {
+            req_str: Some(("arg").into()),
+            cmd: None,
+        },
+        Opt::try_parse_from(&["test", "arg"]).unwrap()
+    );
+
+    assert_eq!(
+        Opt {
+            req_str: None,
+            cmd: Some(SubCommands::ExSub { verbose: 1 }),
+        },
+        Opt::try_parse_from(&["test", "ex-sub", "-v"]).unwrap()
+    );
+
+    assert!(Opt::try_parse_from(&["test"]).is_err());
+}
+
+#[test]
+fn ignore_qualified_option_type() {
+    fn parser(s: &str) -> Option<String> {
+        Some(s.to_string())
+    }
+
+    #[derive(Parser, PartialEq, Debug)]
+    struct Opt {
+        #[clap(parse(from_str = parser))]
+        arg: ::std::option::Option<String>,
+    }
+
+    assert_eq!(
+        Opt {
+            arg: Some("success".into())
+        },
+        Opt::try_parse_from(&["test", "success"]).unwrap()
+    );
+}
+
+#[test]
+fn option_option_type_is_optional_value() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
         #[clap(short, multiple_occurrences(true))]
@@ -169,7 +193,7 @@ fn optional_argument_for_optional_option() {
 }
 
 #[test]
-fn option_option_help() {
+fn option_option_type_help() {
     #[derive(Parser, Debug)]
     struct Opt {
         #[clap(long, value_name = "val")]
@@ -181,7 +205,7 @@ fn option_option_help() {
 }
 
 #[test]
-fn two_option_options() {
+fn two_option_option_types() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
         #[clap(short)]
@@ -235,10 +259,48 @@ fn two_option_options() {
 }
 
 #[test]
-fn optional_vec() {
+fn vec_type_is_multiple_values() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
-        #[clap(short, multiple_occurrences(true))]
+        #[clap(short, long)]
+        arg: Vec<i32>,
+    }
+    assert_eq!(
+        Opt { arg: vec![24] },
+        Opt::try_parse_from(&["test", "-a24"]).unwrap()
+    );
+    assert_eq!(Opt { arg: vec![] }, Opt::try_parse_from(&["test"]).unwrap());
+    assert_eq!(
+        Opt { arg: vec![24, 42] },
+        Opt::try_parse_from(&["test", "-a", "24", "42"]).unwrap()
+    );
+}
+
+#[test]
+fn ignore_qualified_vec_type() {
+    fn parser(s: &str) -> Vec<String> {
+        vec![s.to_string()]
+    }
+
+    #[derive(Parser, PartialEq, Debug)]
+    struct Opt {
+        #[clap(parse(from_str = parser))]
+        arg: ::std::vec::Vec<String>,
+    }
+
+    assert_eq!(
+        Opt {
+            arg: vec!["success".into()]
+        },
+        Opt::try_parse_from(&["test", "success"]).unwrap()
+    );
+}
+
+#[test]
+fn option_vec_type() {
+    #[derive(Parser, PartialEq, Debug)]
+    struct Opt {
+        #[clap(short)]
         arg: Option<Vec<i32>>,
     }
     assert_eq!(
@@ -246,27 +308,6 @@ fn optional_vec() {
         Opt::try_parse_from(&["test", "-a", "1"]).unwrap()
     );
 
-    assert_eq!(
-        Opt {
-            arg: Some(vec![1, 2])
-        },
-        Opt::try_parse_from(&["test", "-a1", "-a2"]).unwrap()
-    );
-
-    assert_eq!(
-        Opt {
-            arg: Some(vec![1, 2])
-        },
-        Opt::try_parse_from(&["test", "-a1", "-a2", "-a"]).unwrap()
-    );
-
-    assert_eq!(
-        Opt {
-            arg: Some(vec![1, 2])
-        },
-        Opt::try_parse_from(&["test", "-a1", "-a", "-a2"]).unwrap()
-    );
-
     assert_eq!(
         Opt {
             arg: Some(vec![1, 2])
@@ -274,34 +315,22 @@ fn optional_vec() {
         Opt::try_parse_from(&["test", "-a", "1", "2"]).unwrap()
     );
 
-    assert_eq!(
-        Opt {
-            arg: Some(vec![1, 2, 3])
-        },
-        Opt::try_parse_from(&["test", "-a", "1", "2", "-a", "3"]).unwrap()
-    );
-
     assert_eq!(
         Opt { arg: Some(vec![]) },
         Opt::try_parse_from(&["test", "-a"]).unwrap()
     );
 
-    assert_eq!(
-        Opt { arg: Some(vec![]) },
-        Opt::try_parse_from(&["test", "-a", "-a"]).unwrap()
-    );
-
     assert_eq!(Opt { arg: None }, Opt::try_parse_from(&["test"]).unwrap());
 }
 
 #[test]
-fn two_optional_vecs() {
+fn two_option_vec_types() {
     #[derive(Parser, PartialEq, Debug)]
     struct Opt {
-        #[clap(short, multiple_occurrences(true))]
+        #[clap(short)]
         arg: Option<Vec<i32>>,
 
-        #[clap(short, multiple_occurrences(true))]
+        #[clap(short)]
         b: Option<Vec<i32>>,
     }
 
@@ -316,9 +345,9 @@ fn two_optional_vecs() {
     assert_eq!(
         Opt {
             arg: Some(vec![1]),
-            b: Some(vec![])
+            b: Some(vec![1])
         },
-        Opt::try_parse_from(&["test", "-a", "-b", "-a1"]).unwrap()
+        Opt::try_parse_from(&["test", "-a", "1", "-b", "1"]).unwrap()
     );
 
     assert_eq!(
@@ -326,7 +355,7 @@ fn two_optional_vecs() {
             arg: Some(vec![1, 2]),
             b: Some(vec![1, 2])
         },
-        Opt::try_parse_from(&["test", "-a1", "-a2", "-b1", "-b2"]).unwrap()
+        Opt::try_parse_from(&["test", "-a", "1", "2", "-b", "1", "2"]).unwrap()
     );
 
     assert_eq!(
@@ -334,42 +363,3 @@ fn two_optional_vecs() {
         Opt::try_parse_from(&["test"]).unwrap()
     );
 }
-
-#[test]
-fn required_option_type() {
-    #[derive(Debug, PartialEq, Eq, Parser)]
-    #[clap(setting(clap::AppSettings::SubcommandsNegateReqs))]
-    struct Opt {
-        #[clap(required = true)]
-        req_str: Option<String>,
-
-        #[clap(subcommand)]
-        cmd: Option<SubCommands>,
-    }
-
-    #[derive(Debug, PartialEq, Eq, Subcommand)]
-    enum SubCommands {
-        ExSub {
-            #[clap(short, long, parse(from_occurrences))]
-            verbose: u8,
-        },
-    }
-
-    assert_eq!(
-        Opt {
-            req_str: Some(("arg").into()),
-            cmd: None,
-        },
-        Opt::try_parse_from(&["test", "arg"]).unwrap()
-    );
-
-    assert_eq!(
-        Opt {
-            req_str: None,
-            cmd: Some(SubCommands::ExSub { verbose: 1 }),
-        },
-        Opt::try_parse_from(&["test", "ex-sub", "-v"]).unwrap()
-    );
-
-    assert!(Opt::try_parse_from(&["test"]).is_err());
-}
diff --git a/clap_derive/tests/privacy.rs b/clap_derive/tests/privacy.rs
index b4609b83..12b53b1f 100644
--- a/clap_derive/tests/privacy.rs
+++ b/clap_derive/tests/privacy.rs
@@ -30,7 +30,7 @@ mod subcommands {
         /// foo
         Foo {
             /// foo
-            bars: Vec<String>,
+            bars: String,
         },
     }
 }
diff --git a/clap_derive/tests/raw_idents.rs b/clap_derive/tests/raw_idents.rs
index 1091379c..12c5d165 100644
--- a/clap_derive/tests/raw_idents.rs
+++ b/clap_derive/tests/raw_idents.rs
@@ -4,14 +4,21 @@ use clap::Parser;
 fn raw_idents() {
     #[derive(Parser, Debug, PartialEq)]
     struct Opt {
-        #[clap(short, long, multiple_occurrences(true))]
-        r#type: Vec<String>,
+        #[clap(short, long)]
+        r#type: String,
     }
 
     assert_eq!(
         Opt {
-            r#type: vec!["long".into(), "short".into()]
+            r#type: "long".into()
         },
-        Opt::try_parse_from(&["test", "--type", "long", "-t", "short"]).unwrap()
+        Opt::try_parse_from(&["test", "--type", "long"]).unwrap()
+    );
+
+    assert_eq!(
+        Opt {
+            r#type: "short".into()
+        },
+        Opt::try_parse_from(&["test", "-t", "short"]).unwrap()
     );
 }
diff --git a/clap_derive/tests/special_types.rs b/clap_derive/tests/special_types.rs
deleted file mode 100644
index e1f9d26e..00000000
--- a/clap_derive/tests/special_types.rs
+++ /dev/null
@@ -1,73 +0,0 @@
-//! Checks that types like `::std::option::Option` are not special
-
-use clap::Parser;
-
-#[rustversion::all(since(1.37), stable)]
-#[test]
-fn special_types_bool() {
-    mod inner {
-        #[allow(non_camel_case_types)]
-        #[derive(PartialEq, Debug)]
-        pub struct bool(pub String);
-
-        impl std::str::FromStr for self::bool {
-            type Err = String;
-
-            fn from_str(s: &str) -> Result<Self, Self::Err> {
-                Ok(self::bool(s.into()))
-            }
-        }
-    }
-
-    #[derive(Parser, PartialEq, Debug)]
-    struct Opt {
-        arg: inner::bool,
-    }
-
-    assert_eq!(
-        Opt {
-            arg: inner::bool("success".into())
-        },
-        Opt::try_parse_from(&["test", "success"]).unwrap()
-    );
-}
-
-#[test]
-fn special_types_option() {
-    fn parser(s: &str) -> Option<String> {
-        Some(s.to_string())
-    }
-
-    #[derive(Parser, PartialEq, Debug)]
-    struct Opt {
-        #[clap(parse(from_str = parser))]
-        arg: ::std::option::Option<String>,
-    }
-
-    assert_eq!(
-        Opt {
-            arg: Some("success".into())
-        },
-        Opt::try_parse_from(&["test", "success"]).unwrap()
-    );
-}
-
-#[test]
-fn special_types_vec() {
-    fn parser(s: &str) -> Vec<String> {
-        vec![s.to_string()]
-    }
-
-    #[derive(Parser, PartialEq, Debug)]
-    struct Opt {
-        #[clap(parse(from_str = parser))]
-        arg: ::std::vec::Vec<String>,
-    }
-
-    assert_eq!(
-        Opt {
-            arg: vec!["success".into()]
-        },
-        Opt::try_parse_from(&["test", "success"]).unwrap()
-    );
-}