cgen: fix fixed array of function str() (fix #10744) (#10753)

vlib/v/gen/c/auto_str_methods.v

@@ -563,11 +563,12 @@ fn (mut g Gen) gen_str_for_array_fixed(info ast.ArrayFixed, styp string, str_fn_
 	g.auto_str_funcs.writeln('static string indent_${str_fn_name}($styp a, int indent_count) {')
 	g.auto_str_funcs.writeln('\tstrings__Builder sb = strings__new_builder($info.size * 10);')
 	g.auto_str_funcs.writeln('\tstrings__Builder_write_string(&sb, _SLIT("["));')
+	g.auto_str_funcs.writeln('\tfor (int i = 0; i < $info.size; ++i) {')
 	if sym.kind == .function {
 		g.auto_str_funcs.writeln('\t\tstring x = ${elem_str_fn_name}();')
+		g.auto_str_funcs.writeln('\t\tstrings__Builder_write_string(&sb, x);')
 	} else {
 		deref, deref_label := deref_kind(str_method_expects_ptr, is_elem_ptr, typ)
-		g.auto_str_funcs.writeln('\tfor (int i = 0; i < $info.size; ++i) {')
 		if should_use_indent_func(sym.kind) && !sym_has_str_method {
 			if is_elem_ptr {
 				g.auto_str_funcs.writeln('\t\tstrings__Builder_write_string(&sb, _SLIT("$deref_label"));')

vlib/v/tests/str_gen_test.v

@@ -438,3 +438,9 @@ fn test_multi_return() {
     value: 'two'
 })"
 }
+
+fn test_fixed_array_of_function() {
+	a := [println, println]!
+	println(a)
+	assert '$a' == '[fn (string), fn (string)]'
+}