fmt: fix multiple problems with types (#6603)

vlib/v/fmt/tests/anon_fn_as_param_keep.vv

@@ -0,0 +1,3 @@
+pub fn (a []int) reduce(iter fn (int, int) int, accum_start int) int {
+	iter(accum_start)
+}

vlib/v/fmt/tests/fixed_size_array_type_keep.vv

@@ -0,0 +1,3 @@
+fn foo() [1]f32 {
+	return [f32(0.0)]!!
+}

vlib/v/fmt/tests/nested_map_type_keep.vv

@@ -0,0 +1,6 @@
+import v.ast
+
+// TODO fix `fn foo(my_map map[string]map[string]int) []ast.FnDecl {`
+fn foo(my_map map[string]map[string]int) int {
+	return 0
+}

vlib/v/table/atypes.v

@@ -801,7 +801,9 @@ pub:
 pub fn (table &Table) type_to_str(t Type) string {
 	sym := table.get_type_symbol(t)
 	mut res := sym.name
-	if sym.kind == .multi_return {
+	if sym.kind in [.array_fixed, .function] {
+		res = sym.source_name
+	} else if sym.kind == .multi_return {
 		res = '('
 		if t.has_flag(.optional) {
 			res = '?' + res

vlib/v/util/util.v

@@ -361,17 +361,20 @@ pub fn no_dots(s string) string {
 	return s.replace('.', '__')
 }
 
+const (
+	map_prefix = 'map[string]'
+)
+
 // no_cur_mod - removes cur_mod. prefix from typename,
 // but *only* when it is at the start, i.e.:
 // no_cur_mod('vproto.Abdcdef', 'proto') == 'vproto.Abdcdef'
 // even though proto. is a substring
 pub fn no_cur_mod(typename, cur_mod string) string {
 	mut res := typename
-	map_prefix := 'map[string]'
 	mod_prefix := cur_mod + '.'
 	has_map_prefix := res.starts_with(map_prefix)
 	if has_map_prefix {
-		res = res.replace(map_prefix, '')
+		res = res.replace_once(map_prefix, '')
 	}
 	no_symbols := res.trim_left('&[]')
 	should_shorten := no_symbols.starts_with(mod_prefix)