parser: fix void assign check

vlib/v/checker/checker.v

@@ -215,7 +215,7 @@ fn (c mut Checker) assign_expr(assign_expr mut ast.AssignExpr) {
 	if !c.table.check(right_type, left_type) {
 		left_type_sym := c.table.get_type_symbol(left_type)
 		right_type_sym := c.table.get_type_symbol(right_type)
-		c.error('cannot assign `$right_type_sym.name` to variable `${assign_expr.left.str()}` of type `$left_type_sym.name` ', assign_expr.pos)
+		c.error('cannot assign `$right_type_sym.name` to variable `${assign_expr.left.str()}` of type `$left_type_sym.name` ', expr_pos(assign_expr.val))
 	}
 	c.check_expr_opt_call(assign_expr.val, right_type, true)
 }

vlib/v/checker/tests/inout/void_fn_as_value.out

@@ -0,0 +1,7 @@
+vlib/v/checker/tests/inout/void_fn_as_value.v:5:8: error: unknown fn: x
+    3| fn main() {
+    4|   mut a := 'aa'
+    5|   a += x('a','b')
+              ~~~~~~~~~~
+    6|   mut b := 'abcdef'
+    7| }

vlib/v/checker/tests/inout/void_fn_as_value.vv

@@ -0,0 +1,7 @@
+module checker
+
+fn main() {
+  mut a := 'aa'
+  a += x('a','b')
+  mut b := 'abcdef'
+}

vlib/v/checker/tests/inout/void_function_assign_to_string.out

@@ -2,6 +2,6 @@ vlib/v/checker/tests/inout/void_function_assign_to_string.v:6:6: error: cannot a
     4| fn main(){
     5|     mut a := ''
     6|     a = x(1,2) // hello
-               ^
+               ~~~~~~
     7|     eprintln('a: $a')
     8| }

vlib/v/parser/fn.v

@@ -7,9 +7,11 @@ import (
 	v.ast
 	v.table
 	v.scanner
+	v.token
 )
 
 pub fn (p mut Parser) call_expr(is_c bool, mod string) ast.CallExpr {
+	first_pos := p.tok.position()
 	tok := p.tok
 	name := p.check_name()
 	fn_name := if is_c {
@@ -21,6 +23,13 @@ pub fn (p mut Parser) call_expr(is_c bool, mod string) ast.CallExpr {
 	}
 	p.check(.lpar)
 	args := p.call_args()
+	last_pos := p.tok.position()
+	p.check(.rpar)
+	pos := token.Position{
+		line_nr: first_pos.line_nr
+		pos: first_pos.pos
+		len: last_pos.pos - first_pos.pos + last_pos.len
+	}
 	mut or_stmts := []ast.Stmt
 	mut is_or_block_used := false
 	if p.tok.kind == .key_orelse {
@@ -42,7 +51,7 @@ pub fn (p mut Parser) call_expr(is_c bool, mod string) ast.CallExpr {
 		name: fn_name
 		args: args
 		mod: p.mod
-		pos: tok.position()
+		pos: pos
 		is_c: is_c
 		or_block: ast.OrExpr{
 			stmts: or_stmts
@@ -69,7 +78,6 @@ pub fn (p mut Parser) call_args() []ast.CallArg {
 			p.check(.comma)
 		}
 	}
-	p.check(.rpar)
 	return args
 }
 

vlib/v/parser/parser.v

@@ -960,6 +960,7 @@ fn (p mut Parser) dot_expr(left ast.Expr) ast.Expr {
 	if p.tok.kind == .lpar {
 		p.next()
 		args := p.call_args()
+		p.check(.rpar)
 		mut or_stmts := []ast.Stmt
 		mut is_or_block_used := false
 		if p.tok.kind == .key_orelse {