make all necessary structs public

vlib/benchmark/benchmark.v

@@ -26,7 +26,7 @@ println( bmark.total_message('remarks about the benchmark') )
 ```
 */
 
-struct Benchmark{
+pub struct Benchmark{
 pub mut:
 	bench_start_time i64
 	bench_end_time i64

vlib/builtin/map.v

@@ -6,7 +6,7 @@ module builtin
 
 import strings
 
-struct map {
+pub struct map {
 	element_size int
 	root      &mapnode
 pub:

vlib/builtin/string.v

@@ -43,7 +43,7 @@ NB: A V string should be/is immutable from the point of view of
 
 import strconv
 
-struct string {
+pub struct string {
 //mut:
 	//hash_cache int
 pub:
@@ -51,7 +51,7 @@ pub:
 	len int     // the length of the .str field, excluding the ending 0 byte. It is always equal to strlen(.str).
 }
 
-struct ustring {
+pub struct ustring {
 pub:
 	s     string
 	runes []int

vlib/compiler/parser.v

@@ -1100,6 +1100,9 @@ fn (p mut Parser) get_type() string {
 				p.error('unknown type `$typ`')
 			}
 		}
+		else if !t.is_public && t.mod != p.mod && t.name != '' {
+			p.warn('type `$t.name` is private')
+		}	
 	}
 	if typ == 'void' {
 		p.error('unknown type `$typ`')
@@ -3179,6 +3182,9 @@ fn (p mut Parser) array_init() string {
 fn (p mut Parser) struct_init(typ string) string {
 	p.is_struct_init = true
 	t := p.table.find_type(typ)
+	if !t.is_public && t.mod != p.mod {
+		p.warn('type `$t.name` is private')
+	}	
 	if p.gen_struct_init(typ, t) { return typ }
 	p.scanner.fmt_out.cut(typ.len)
 	ptr := typ.contains('*')
@@ -4120,7 +4126,7 @@ fn (p mut Parser) js_decode() string {
 		p.gen('json__jsdecode_$typ($cjson_tmp, &$tmp); cJSON_Delete($cjson_tmp);')
 		opt_type := 'Option_$typ'
 		p.cgen.typedefs << 'typedef Option $opt_type;'
-		p.table.register_type(opt_type)
+		p.table.register_builtin(opt_type)
 		return opt_type
 	}
 	else if op == 'encode' {

vlib/compiler/query.v

@@ -180,7 +180,7 @@ for (int i = 0; i < ${qprefix}rows.len; i++) {
 	}	else if query_one {		
 		opt_type := 'Option_$table_name'		
 		p.cgen.typedefs << 'typedef Option $opt_type;'
-		p.table.register_type( opt_type )
+		p.table.register_builtin( opt_type )
 		return opt_type
 	}  else {
 		p.register_array('array_$table_name')

vlib/compiler/table.v

@@ -234,8 +234,8 @@ fn new_table(obfuscate bool) &Table {
 	mut t := &Table {
 		obfuscate: obfuscate
 	}
-	t.register_type('int')
-	t.register_type('size_t')
+	t.register_builtin('int')
+	t.register_builtin('size_t')
 	t.register_type_with_parent('i8', 'int')
 	t.register_type_with_parent('byte', 'int')
 	t.register_type_with_parent('char', 'int') // for C functions only, to avoid warnings
@@ -244,17 +244,17 @@ fn new_table(obfuscate bool) &Table {
 	t.register_type_with_parent('u32', 'int')
 	t.register_type_with_parent('i64', 'int')
 	t.register_type_with_parent('u64', 'u32')
-	t.register_type('byteptr')
-	t.register_type('intptr')
-	t.register_type('f32')
-	t.register_type('f64')
-	t.register_type('rune')
-	t.register_type('bool')
-	t.register_type('void')
-	t.register_type('voidptr')
-	t.register_type('va_list')
+	t.register_builtin('byteptr')
+	t.register_builtin('intptr')
+	t.register_builtin('f32')
+	t.register_builtin('f64')
+	t.register_builtin('rune')
+	t.register_builtin('bool')
+	t.register_builtin('void')
+	t.register_builtin('voidptr')
+	t.register_builtin('va_list')
 	for c in reserved_type_param_names {
-		t.register_type(c)
+		t.register_builtin(c)
 	}
 	t.register_const('stdin', 'int', 'main', true)
 	t.register_const('stdout', 'int', 'main', true)
@@ -390,14 +390,14 @@ fn (t &Table) known_const(name string) bool {
 	return true
 }
 
-fn (t mut Table) register_type(typ string) {
+fn (t mut Table) register_builtin(typ string) {
 	if typ.len == 0 {
 		return
 	}
 	if typ in t.typesmap {
 		return
 	}
-	t.typesmap[typ] = Type{name:typ}
+	t.typesmap[typ] = Type{name:typ, is_public:true}
 }
 
 fn (p mut Parser) register_type_with_parent(strtyp, parent string) {
@@ -405,6 +405,7 @@ fn (p mut Parser) register_type_with_parent(strtyp, parent string) {
 		name: strtyp
 		parent: parent
 		mod: p.mod
+		is_public: true
 	}
 	p.table.register_type2(typ)
 }
@@ -416,6 +417,7 @@ fn (t mut Table) register_type_with_parent(typ, parent string) {
 	t.typesmap[typ] = Type {
 		name: typ
 		parent: parent
+		is_public: true
 		//mod: mod
 	}
 }

vlib/os/os.v

@@ -35,7 +35,7 @@ struct C.FILE {
 	
 }
 
-struct File {
+pub struct File {
 	cfile &FILE
 }
 

vlib/strings/builder_c.v

@@ -4,7 +4,7 @@
 
 module strings
 
-struct Builder {
+pub struct Builder {
 mut:
 	buf []byte
 pub:

vlib/strings/builder_js.v

@@ -4,7 +4,7 @@
 
 module strings
 
-struct Builder {
+pub struct Builder {
 mut:
 	buf []byte
 pub: