parser: allow `arr = []` instead of `arr = []string`

vlib/compiler/main.v

@@ -569,6 +569,9 @@ pub fn (v &V) v_files_from_dir(dir string) []string {
 // Parses imports, adds necessary libs, and then user files
 pub fn (v mut V) add_v_files_to_compile() {
 	mut builtin_files := v.get_builtin_files()
+	if v.pref.is_bare {
+		builtin_files = []string
+	}	
 	// Builtin cache exists? Use it.
 	builtin_vh := '$v_modules_path${os.path_separator}vlib${os.path_separator}builtin.vh'
 	if v.pref.is_cache && os.file_exists(builtin_vh) {

vlib/compiler/parser.v

@@ -2424,12 +2424,15 @@ fn (p mut Parser) array_init() string {
 	}
 	p.check(.rsbr)
 	// type after `]`? (e.g. "[]string")
-	if p.tok != .name && i == 0 {
+	if p.tok != .name && i == 0 && !p.expected_type.starts_with('array_') {
 		p.error('specify array type: `[]typ` instead of `[]`')
 	}
 	if p.tok == .name && i == 0 {
 		// vals.len == 0 {
 		typ = p.get_type()
+	} else if p.expected_type.starts_with('array_') {
+		// allow `known_array = []`
+		typ = p.expected_type[6..]
 	}	
 	// ! after array => no malloc and no copy
 	no_alloc := p.tok == .not