fmt: fix `map[string][]string`; parser: allow `foo<int>(10)`

vlib/v/fmt/fmt.v

@@ -476,8 +476,8 @@ pub fn (mut f Fmt) struct_decl(node ast.StructDecl) {
 
 fn (f &Fmt) type_to_str(t table.Type) string {
 	mut res := f.table.type_to_str(t)
-	// type_ptr => &type
 	if res.ends_with('_ptr') {
+		// type_ptr => &type
 		res = res[0..res.len - 4]
 		start_pos := 2 * res.count('[]')
 		res = res[0..start_pos] + '&' + res[start_pos..res.len]

vlib/v/parser/fn.v

@@ -21,10 +21,16 @@ pub fn (mut p Parser) call_expr(language table.Language, mod string) ast.CallExp
 	}
 	mut is_or_block_used := false
 	if fn_name == 'json.decode' {
-		p.expecting_type = true // Makes name_expr() parse the type (`User` in `json.decode(User, txt)`)`
+		p.expecting_type = true // Makes name_expr() parse the type `User` in `json.decode(User, txt)`
 		p.expr_mod = ''
 		is_or_block_used = true
 	}
+	if p.tok.kind == .lt {
+		// `foo<int>(10)`
+		p.next() // `<`
+		p.parse_type()
+		p.check(.gt) // `>`
+	}
 	p.check(.lpar)
 	args := p.call_args()
 	last_pos := p.tok.position()

vlib/v/parser/parser.v

@@ -803,7 +803,8 @@ pub fn (mut p Parser) name_expr() ast.Expr {
 	}
 	// p.warn('name expr  $p.tok.lit $p.peek_tok.str()')
 	// fn call or type cast
-	if p.peek_tok.kind == .lpar {
+	if p.peek_tok.kind == .lpar || (p.peek_tok.kind == .lt && p.peek_tok.pos == p.peek_tok2.pos -
+		1) { // foo() or foo<int>()
 		mut name := p.tok.lit
 		if mod.len > 0 {
 			name = '${mod}.$name'

vlib/v/table/atypes.v

@@ -15,7 +15,8 @@ import strings
 
 pub type Type int
 
-pub type TypeInfo = Alias | Array | ArrayFixed | Enum | FnType | Interface | Map | MultiReturn | Struct | SumType
+pub type TypeInfo = Alias | Array | ArrayFixed | Enum | FnType | Interface | Map | MultiReturn |
+	Struct | SumType
 
 pub enum Language {
 	v
@@ -490,6 +491,11 @@ pub fn (mut t Table) register_builtin_type_symbols() {
 		mod: 'builtin'
 		parent_idx: map_string_int_idx
 	})
+	t.register_type_symbol(TypeSymbol{
+		kind: .any
+		name: 'T'
+		mod: 'builtin'
+	})
 }
 
 [inline]
@@ -629,6 +635,7 @@ pub:
 	variants []Type
 }
 
+// TODO simplify this method
 pub fn (table &Table) type_to_str(t Type) string {
 	sym := table.get_type_symbol(t)
 	mut res := sym.name
@@ -649,7 +656,8 @@ pub fn (table &Table) type_to_str(t Type) string {
 	}
 	if sym.kind == .array || 'array_' in res {
 		res = res.replace('array_', '[]')
-	} else if sym.kind == .map || 'map_string_' in res {
+	}
+	if sym.kind == .map || 'map_string_' in res {
 		res = res.replace('map_string_', 'map[string]')
 	}
 	// mod.submod.submod2.Type => submod2.Type

vlib/v/table/table.v

@@ -15,6 +15,7 @@ pub mut:
 	modules       []string // List of all modules registered by the application
 	cflags        []cflag.CFlag
 	redefined_fns []string
+	fn_gen_types  map[string][]string
 }
 
 pub struct Fn {
@@ -467,9 +468,9 @@ pub fn (t &Table) check(got, expected Type) bool {
 		got_idx in number_type_idxs) {
 		return true
 	}
-	//if exp_idx in pointer_type_idxs && got_idx in pointer_type_idxs {
-		//return true
-	//}
+	// if exp_idx in pointer_type_idxs && got_idx in pointer_type_idxs {
+	// return true
+	// }
 	// see hack in checker IndexExpr line #691
 	if (got_idx == byte_type_idx && exp_idx == byteptr_type_idx) || (exp_idx == byte_type_idx &&
 		got_idx == byteptr_type_idx) {