checker: check unsafe array assign (fix #9651) (#15515)

cmd/tools/vgret.v

@@ -321,7 +321,7 @@ fn take_screenshots(opt Options, app AppConfig) ![]string {
 					os.setenv('$k', rv, true)
 				}
 
-				mut flags := app.capture.flags.join(' ')
+				flags := app.capture.flags.join(' ')
 				result := opt.verbose_execute('${os.quoted_path(v_exe)} $flags -d gg_record run ${os.quoted_path(app.abs_path)}')
 				if result.exit_code != 0 {
 					return error('Failed taking screenshot of `$app.abs_path`:\n$result.output')
@@ -336,7 +336,7 @@ fn take_screenshots(opt Options, app AppConfig) ![]string {
 
 				existing_screenshots := get_app_screenshots(out_path, app)!
 
-				mut flags := app.capture.flags
+				flags := app.capture.flags
 
 				mut p_app := os.new_process(app.abs_path)
 				p_app.set_args(flags)

cmd/tools/vpm.v

@@ -86,7 +86,7 @@ fn main() {
 			if module_names.len == 0 && os.exists('./v.mod') {
 				println('Detected v.mod file inside the project directory. Using it...')
 				manifest := vmod.from_file('./v.mod') or { panic(err) }
-				module_names = manifest.dependencies
+				module_names = manifest.dependencies.clone()
 			}
 			mut source := Source.vpm
 			if '--once' in options {

cmd/tools/vrepl.v

@@ -154,7 +154,7 @@ fn (r &Repl) current_source_code(should_add_temp_lines bool, not_add_print bool)
 		if !not_add_print {
 			lines = r.vstartup_lines.filter(!it.starts_with('print'))
 		} else {
-			lines = r.vstartup_lines
+			lines = r.vstartup_lines.clone()
 		}
 		all_lines << lines
 	}