fix(error): Try to soften unexpected argument/value errors

Adding "found" might seem minor but I feel it has a slight softening on the message.  It also maintains scanability as it is at the end and short.

As this is a one-off message change and not a styling issue to be consistent with, I think this is safe to put in a patch release.

examples/derive_ref/interop_tests.md

@@ -35,7 +35,7 @@ Value of derived: DerivedArgs {
 ```console
 $ interop_augment_args --unknown
 ? failed
-error: unexpected argument '--unknown'
+error: unexpected argument '--unknown' found
 
 Usage: interop_augment_args[EXE] [OPTIONS]
 
@@ -70,7 +70,7 @@ Derived subcommands: Derived {
 ```console
 $ interop_augment_subcommands derived --unknown
 ? failed
-error: unexpected argument '--unknown'
+error: unexpected argument '--unknown' found
 
 Usage: interop_augment_subcommands[EXE] derived [OPTIONS]
 
@@ -140,7 +140,7 @@ Cli {
 ```console
 $ interop_hand_subcommand add --unknown
 ? failed
-error: unexpected argument '--unknown'
+error: unexpected argument '--unknown' found
 
   note: to pass '--unknown' as a value, use '-- --unknown'
 
@@ -239,7 +239,7 @@ Cli {
 ```console
 $ interop_flatten_hand_args --unknown
 ? failed
-error: unexpected argument '--unknown'
+error: unexpected argument '--unknown' found
 
 Usage: interop_flatten_hand_args[EXE] [OPTIONS]
 

examples/escaped-positional-derive.md

@@ -33,7 +33,7 @@ Notice that we can't pass positional arguments before `--`:
 ```console
 $ escaped-positional-derive foo bar
 ? failed
-error: unexpected argument 'foo'
+error: unexpected argument 'foo' found
 
 Usage: escaped-positional-derive[EXE] [OPTIONS] [-- <SLOP>...]
 

examples/escaped-positional.md

@@ -33,7 +33,7 @@ Notice that we can't pass positional arguments before `--`:
 ```console
 $ escaped-positional foo bar
 ? failed
-error: unexpected argument 'foo'
+error: unexpected argument 'foo' found
 
 Usage: escaped-positional[EXE] [OPTIONS] [-- <SLOP>...]
 

src/error/format.rs

@@ -282,7 +282,7 @@ fn write_dynamic_context(error: &crate::error::Error, styled: &mut StyledStr) ->
                 styled.warning(invalid_value);
                 styled.none("' for '");
                 styled.warning(invalid_arg);
-                styled.none("'; no more were expected");
+                styled.none("' found; no more were expected");
                 true
             } else {
                 false
@@ -360,7 +360,7 @@ fn write_dynamic_context(error: &crate::error::Error, styled: &mut StyledStr) ->
             if let Some(ContextValue::String(invalid_arg)) = invalid_arg {
                 styled.none("unexpected argument '");
                 styled.warning(invalid_arg.to_string());
-                styled.none("'");
+                styled.none("' found");
                 true
             } else {
                 false

src/error/kind.rs

@@ -317,11 +317,11 @@ impl ErrorKind {
     pub fn as_str(self) -> Option<&'static str> {
         match self {
             Self::InvalidValue => Some("one of the values isn't valid for an argument"),
-            Self::UnknownArgument => Some("unexpected argument"),
+            Self::UnknownArgument => Some("unexpected argument found"),
             Self::InvalidSubcommand => Some("unrecognized subcommand"),
             Self::NoEquals => Some("equal is needed when assigning values to one of the arguments"),
             Self::ValueValidation => Some("invalid value for one of the arguments"),
-            Self::TooManyValues => Some("unexpected value for an argument"),
+            Self::TooManyValues => Some("unexpected value for an argument found"),
             Self::TooFewValues => Some("more values required for an argument"),
             Self::WrongNumberOfValues => Some("too many or too few values for an argument"),
             Self::ArgumentConflict => {

tests/builder/conflicts.rs

@@ -734,7 +734,7 @@ fn args_negate_subcommands_two_levels() {
 #[cfg(feature = "error-context")]
 fn subcommand_conflict_error_message() {
     static CONFLICT_ERR: &str = "\
-error: unexpected argument 'sub1'
+error: unexpected argument 'sub1' found
 
 Usage: test [OPTIONS]
        test <COMMAND>

tests/builder/error.rs

@@ -106,7 +106,7 @@ fn kind_formats_validation_error() {
     let err = res.unwrap_err();
     let expected_kind = ErrorKind::UnknownArgument;
     static MESSAGE: &str = "\
-error: unexpected argument
+error: unexpected argument found
 ";
     assert_error(err, expected_kind, MESSAGE, true);
 }
@@ -120,7 +120,7 @@ fn rich_formats_validation_error() {
     let err = res.unwrap_err();
     let expected_kind = ErrorKind::UnknownArgument;
     static MESSAGE: &str = "\
-error: unexpected argument 'unused'
+error: unexpected argument 'unused' found
 
 Usage: test
 
@@ -139,7 +139,7 @@ fn suggest_trailing() {
     let err = res.unwrap_err();
     let expected_kind = ErrorKind::UnknownArgument;
     static MESSAGE: &str = "\
-error: unexpected argument '--foo'
+error: unexpected argument '--foo' found
 
   note: to pass '--foo' as a value, use '-- --foo'
 
@@ -160,7 +160,7 @@ fn trailing_already_in_use() {
     let err = res.unwrap_err();
     let expected_kind = ErrorKind::UnknownArgument;
     static MESSAGE: &str = "\
-error: unexpected argument '--foo'
+error: unexpected argument '--foo' found
 
 Usage: rg [PATTERN]
 
@@ -179,7 +179,7 @@ fn cant_use_trailing() {
     let err = res.unwrap_err();
     let expected_kind = ErrorKind::UnknownArgument;
     static MESSAGE: &str = "\
-error: unexpected argument '--foo'
+error: unexpected argument '--foo' found
 
 Usage: test
 

tests/builder/flags.rs

@@ -140,7 +140,7 @@ fn multiple_flags_in_single() {
 #[cfg(feature = "error-context")]
 fn unexpected_value_error() {
     const USE_FLAG_AS_ARGUMENT: &str = "\
-error: unexpected value 'foo' for '--a-flag'; no more were expected
+error: unexpected value 'foo' for '--a-flag' found; no more were expected
 
 Usage: mycat --a-flag [filename]
 
@@ -158,7 +158,7 @@ For more information, try '--help'.
 #[cfg(feature = "error-context")]
 fn issue_1284_argument_in_flag_style() {
     const USE_FLAG_AS_ARGUMENT: &str = "\
-error: unexpected argument '--another-flag'
+error: unexpected argument '--another-flag' found
 
   note: to pass '--another-flag' as a value, use '-- --another-flag'
 
@@ -202,7 +202,7 @@ For more information, try '--help'.
 #[cfg(feature = "error-context")]
 fn issue_2308_multiple_dashes() {
     static MULTIPLE_DASHES: &str = "\
-error: unexpected argument '-----'
+error: unexpected argument '-----' found
 
   note: to pass '-----' as a value, use '-- -----'
 

tests/builder/opts.rs

@@ -446,7 +446,7 @@ fn leading_hyphen_with_only_pos_follows() {
 #[cfg(feature = "error-context")]
 fn did_you_mean() {
     static DYM: &str = "\
-error: unexpected argument '--optio'
+error: unexpected argument '--optio' found
 
   note: argument '--option' exists
 
@@ -544,7 +544,7 @@ fn issue_1105_empty_value_short_explicit_no_space() {
 #[cfg(feature = "error-context")]
 fn issue_1073_suboptimal_flag_suggestion() {
     static DYM_ISSUE_1073: &str = "\
-error: unexpected argument '--files-without-matches'
+error: unexpected argument '--files-without-matches' found
 
   note: argument '--files-without-match' exists
 

tests/builder/subcommands.rs

@@ -139,7 +139,7 @@ For more information, try '--help'.
 #[cfg(feature = "error-context")]
 fn subcmd_did_you_mean_output_arg() {
     static EXPECTED: &str = "\
-error: unexpected argument '--subcmarg'
+error: unexpected argument '--subcmarg' found
 
   note: 'subcmd --subcmdarg' exists
 
@@ -159,7 +159,7 @@ For more information, try '--help'.
 #[cfg(feature = "error-context")]
 fn subcmd_did_you_mean_output_arg_false_positives() {
     static EXPECTED: &str = "\
-error: unexpected argument '--subcmarg'
+error: unexpected argument '--subcmarg' found
 
 Usage: dym [COMMAND]
 
@@ -351,7 +351,7 @@ fn subcommand_placeholder_test() {
 #[cfg(feature = "error-context")]
 fn subcommand_used_after_double_dash() {
     static SUBCMD_AFTER_DOUBLE_DASH: &str = "\
-error: unexpected argument 'subcmd'
+error: unexpected argument 'subcmd' found
 
   note: subcommand 'subcmd' exists; to use it, remove the '--' before it
 

tests/ui/error_stderr.toml

@@ -3,7 +3,7 @@ args = ["--unknown-argument"]
 status.code = 2
 stdout = ""
 stderr = """
-error: unexpected argument '--unknown-argument'
+error: unexpected argument '--unknown-argument' found
 
 Usage: stdio-fixture[EXE] [OPTIONS] [COMMAND]