diff --git a/vlib/v/ast/ast.v b/vlib/v/ast/ast.v
index dfddc60056..3ef0e4354f 100644
--- a/vlib/v/ast/ast.v
+++ b/vlib/v/ast/ast.v
@@ -170,6 +170,7 @@ pub:
 	args     []Expr
 	muts     []bool
 	or_block OrExpr
+mut:
 	typ      table.Type
 }
 
diff --git a/vlib/v/ast/scope.v b/vlib/v/ast/scope.v
index d5e8d41d0f..3e9b79bb9b 100644
--- a/vlib/v/ast/scope.v
+++ b/vlib/v/ast/scope.v
@@ -117,7 +117,7 @@ pub fn (s &Scope) innermost(pos int) ?&Scope {
 
 [inline]
 fn (s &Scope) contains(pos int) bool {
-	return pos > s.start_pos && pos < s.end_pos
+	return pos >= s.start_pos && pos <= s.end_pos
 }
 
 pub fn (sc &Scope) show(level int) string {
diff --git a/vlib/v/checker/checker.v b/vlib/v/checker/checker.v
index ddac2c378c..8a4540cbb3 100644
--- a/vlib/v/checker/checker.v
+++ b/vlib/v/checker/checker.v
@@ -145,7 +145,7 @@ pub fn (c mut Checker) infix_expr(infix_expr ast.InfixExpr) table.Type {
 	return left_type
 }
 
-fn (c mut Checker) check_assign_expr(assign_expr ast.AssignExpr) {
+fn (c mut Checker) assign_expr(assign_expr ast.AssignExpr) {
 	match assign_expr.left {
 		ast.Ident {
 			if it.kind == .blank_ident {
@@ -239,25 +239,52 @@ pub fn (c mut Checker) call_expr(call_expr ast.CallExpr) table.Type {
 	return f.return_type
 }
 
-pub fn (c mut Checker) check_method_call_expr(method_call_expr ast.MethodCallExpr) table.Type {
+// TODO: clean this up, remove dupe code & consider merging method/fn call everywhere
+pub fn (c mut Checker) method_call_expr(method_call_expr mut ast.MethodCallExpr) table.Type {
 	typ := c.expr(method_call_expr.expr)
+	method_call_expr.typ = typ
 	typ_sym := c.table.get_type_symbol(typ)
 	name := method_call_expr.name
-	if method := typ_sym.find_method(name) {
-		return method.return_type
-	}
 	if typ_sym.kind == .array && name in ['filter', 'clone'] {
+		if name == 'filter' {
+			array_info := typ_sym.info as table.Array
+			elem_type_sym := c.table.get_type_symbol(array_info.elem_type)
+			mut scope := c.file.scope.innermost(method_call_expr.pos.pos) or {
+				c.file.scope
+			}
+			scope.override_var(ast.VarDecl{
+				name: 'it'
+				typ: array_info.elem_type
+			})
+		}
+		if method := typ_sym.find_method(name) {
+			for i, arg_expr in method_call_expr.args {
+				c.expected_type = method.args[i].typ
+				c.expr(arg_expr)
+			}
+		}
 		return typ
 	}
-	if typ_sym.kind == .array && name in ['first', 'last'] {
+	else if typ_sym.kind == .array && name in ['first', 'last'] {
 		info := typ_sym.info as table.Array
 		return info.elem_type
 	}
+	if method := typ_sym.find_method(name) {
+		for i, arg_expr in method_call_expr.args {
+			c.expected_type = method.args[i].typ
+			c.expr(arg_expr)
+		}
+		return method.return_type
+	}
 	// check parent
 	if typ_sym.parent_idx != 0 {
 		parent := &c.table.types[typ_sym.parent_idx]
 		if method := parent.find_method(name) {
 			// println('got method $name, returning')
+			for i, arg_expr in method_call_expr.args {
+				c.expected_type = method.args[i].typ
+				c.expr(arg_expr)
+			}
 			return method.return_type
 		}
 	}
@@ -493,7 +520,7 @@ pub fn (c mut Checker) expr(node ast.Expr) table.Type {
 			return it.typ
 		}
 		ast.AssignExpr {
-			c.check_assign_expr(it)
+			c.assign_expr(it)
 		}
 		ast.Assoc {
 			scope := c.file.scope.innermost(it.pos.pos) or {
@@ -547,7 +574,7 @@ pub fn (c mut Checker) expr(node ast.Expr) table.Type {
 			return c.match_expr(mut it)
 		}
 		ast.MethodCallExpr {
-			return c.check_method_call_expr(it)
+			return c.method_call_expr(mut it)
 		}
 		ast.PostfixExpr {
 			return c.postfix_expr(it)
diff --git a/vlib/v/gen/cgen.v b/vlib/v/gen/cgen.v
index d4883fbe79..ffdfae85b9 100644
--- a/vlib/v/gen/cgen.v
+++ b/vlib/v/gen/cgen.v
@@ -491,9 +491,17 @@ fn (g mut Gen) expr(node ast.Expr) {
 			}
 		}
 		ast.MethodCallExpr {
-			typ := 'TODO'
-			name := it.name.replace('.', '__')
-			g.write('${typ}_${name}(')
+			mut receiver_name := 'TODO'
+			// TODO: there are still due to unchecked exprs (opt/some fn arg)
+			if it.typ != 0 {
+				typ_sym := g.table.get_type_symbol(it.typ)
+				receiver_name = typ_sym.name
+			}
+			name := '${receiver_name}_$it.name'.replace('.', '__')
+			if table.type_is_ptr(it.typ) {
+				g.write('&')
+			}
+			g.write('${name}(')
 			g.expr(it.expr)
 			if it.args.len > 0 {
 				g.write(', ')
diff --git a/vlib/v/parser/parser.v b/vlib/v/parser/parser.v
index a91677e391..19a326cc08 100644
--- a/vlib/v/parser/parser.v
+++ b/vlib/v/parser/parser.v
@@ -450,12 +450,13 @@ pub fn (p &Parser) warn(s string) {
 
 pub fn (p mut Parser) parse_ident(is_c bool) ast.Ident {
 	// p.warn('name ')
+	pos := p.tok.position()
 	mut name := p.check_name()
 	if name == '_' {
 		return ast.Ident{
 			name: '_'
 			kind: .blank_ident
-			pos: p.tok.position()
+			pos: pos
 		}
 	}
 	if p.expr_mod.len > 0 {
@@ -465,7 +466,7 @@ pub fn (p mut Parser) parse_ident(is_c bool) ast.Ident {
 		kind: .unresolved
 		name: name
 		is_c: is_c
-		pos: p.tok.position()
+		pos: pos
 	}
 	// variable
 	if p.expr_mod.len == 0 {
@@ -635,11 +636,9 @@ pub fn (p mut Parser) expr(precedence int) ast.Expr {
 		}
 		.dot {
 			// .enum_val
-			// node,typ = p.enum_val()
 			node = p.enum_val()
 		}
 		.chartoken {
-			typ = table.byte_type
 			node = ast.CharLiteral{
 				val: p.tok.lit
 			}
@@ -656,11 +655,9 @@ pub fn (p mut Parser) expr(precedence int) ast.Expr {
 			node = ast.BoolLiteral{
 				val: p.tok.kind == .key_true
 			}
-			typ = table.bool_type
 			p.next()
 		}
 		.key_match {
-			// node,typ = p.match_expr()
 			node = p.match_expr()
 		}
 		.number {
@@ -682,7 +679,6 @@ pub fn (p mut Parser) expr(precedence int) ast.Expr {
 		}
 		.key_none {
 			p.next()
-			typ = table.none_type
 			node = ast.None{}
 		}
 		.key_sizeof {
@@ -700,7 +696,6 @@ pub fn (p mut Parser) expr(precedence int) ast.Expr {
 			node = ast.SizeOf{
 				type_name: type_name
 			}
-			typ = table.int_type
 		}
 		// Map `{"age": 20}` or `{ x | foo:bar, a:10 }`
 		.lcbr {
@@ -761,7 +756,7 @@ pub fn (p mut Parser) expr(precedence int) ast.Expr {
 			node = p.assign_expr(node)
 		}
 		else if p.tok.kind == .dot {
-			node = p.dot_expr(node, typ)
+			node = p.dot_expr(node)
 		}
 		else if p.tok.kind == .lsbr {
 			node = p.index_expr(node)
@@ -852,15 +847,6 @@ fn (p mut Parser) index_expr(left ast.Expr) ast.IndexExpr {
 			}
 		}
 	}
-	// get the element type
-	/*
-	mut typ := left_type
-	left_type_sym := p.table.get_type_symbol(left_type)
-	if left_type_sym.kind == .array {
-		info := left_type_sym.info as table.Array
-		typ = info.elem_type
-	}
-	*/
 	// [expr]
 	p.check(.rsbr)
 	return ast.IndexExpr{
@@ -870,24 +856,25 @@ fn (p mut Parser) index_expr(left ast.Expr) ast.IndexExpr {
 	}
 }
 
-fn (p mut Parser) filter(typ table.Type) {
+fn (p mut Parser) filter() {
 	p.scope.register_var(ast.VarDecl{
 		name: 'it'
-		typ: typ
 	})
 }
 
-fn (p mut Parser) dot_expr(left ast.Expr, left_type table.Type) ast.Expr {
+fn (p mut Parser) dot_expr(left ast.Expr) ast.Expr {
 	p.next()
 	field_name := p.check_name()
 	if field_name == 'filter' {
 		p.open_scope()
-		p.filter(left_type)
-		defer {
-			p.close_scope()
-		}
+		p.filter()
+		// wrong tok position when using defer
+		// defer {
+		// 	p.close_scope()
+		// }
 	}
 	// Method call
+	pos := p.tok.position()
 	if p.tok.kind == .lpar {
 		p.next()
 		args,muts := p.call_args()
@@ -901,13 +888,16 @@ fn (p mut Parser) dot_expr(left ast.Expr, left_type table.Type) ast.Expr {
 			name: field_name
 			args: args
 			muts: muts
-			pos: p.tok.position()
+			pos: pos
 			or_block: ast.OrExpr{
 				stmts: or_stmts
 			}
 		}
 		mut node := ast.Expr{}
 		node = mcall_expr
+		if field_name == 'filter' {
+			p.close_scope()
+		}
 		return node
 	}
 	sel_expr := ast.SelectorExpr{
@@ -917,6 +907,9 @@ fn (p mut Parser) dot_expr(left ast.Expr, left_type table.Type) ast.Expr {
 	}
 	mut node := ast.Expr{}
 	node = sel_expr
+	if field_name == 'filter' {
+		p.close_scope()
+	}
 	return node
 }