Fix failing tests: cargo install may not be called from a workspace, replaced max_values -> number_of_values

Author: DamianX

src/bin/cargo/commands/install.rs

@@ -79,10 +79,10 @@ pub fn exec(config: &mut Config, args: &ArgMatches<'_>) -> CliResult {
 
     config.reload_rooted_at_cargo_home()?;
     let mut compile_opts = args.compile_options(config, CompileMode::Build)?;
-
-    let ws = args.workspace(config)?;
-
-    args.check_optional_opts_example_and_bin(&ws, &compile_opts)?;
+    
+    if let Ok(ws) = args.workspace(config) {
+        args.check_optional_opts_example_and_bin(&ws, &compile_opts)?;
+    }
 
     compile_opts.build_config.release = !args.is_present("debug");
 

src/cargo/util/command_prelude.rs

@@ -206,7 +206,7 @@ pub fn optional_multi_opt(
         .value_name(value_name)
         .multiple(true)
         .min_values(0)
-        .max_values(1)
+        .number_of_values(1)
 }
 
 pub fn multi_opt(