parser: fix position of array init (#6998)

vlib/v/ast/ast.v

@@ -1072,9 +1072,6 @@ pub fn (expr Expr) position() token.Position {
 		InfixExpr {
 			left_pos := expr.left.position()
 			right_pos := expr.right.position()
-			if left_pos.pos == 0 || right_pos.pos == 0 {
-				return expr.pos
-			}
 			return token.Position{
 				line_nr: expr.pos.line_nr
 				pos: left_pos.pos

vlib/v/parser/containers.v

@@ -5,7 +5,6 @@ module parser
 
 import v.ast
 import v.table
-import v.token
 
 fn (mut p Parser) array_init() ast.ArrayInit {
 	first_pos := p.tok.position()
@@ -23,6 +22,7 @@ fn (mut p Parser) array_init() ast.ArrayInit {
 	mut has_default := false
 	mut default_expr := ast.Expr{}
 	if p.tok.kind == .rsbr {
+		last_pos = p.tok.position()
 		// []typ => `[]` and `typ` must be on the same line
 		line_nr := p.tok.line_nr
 		p.next()
@@ -126,11 +126,7 @@ fn (mut p Parser) array_init() ast.ArrayInit {
 		}
 		p.check(.rcbr)
 	}
-	pos := token.Position{
-		line_nr: first_pos.line_nr
-		pos: first_pos.pos
-		len: last_pos.pos - first_pos.pos + last_pos.len
-	}
+	pos := first_pos.extend(last_pos)
 	return ast.ArrayInit{
 		is_fixed: is_fixed
 		has_val: has_val

vlib/v/parser/tests/array_pos_err.out

@@ -0,0 +1,5 @@
+vlib/v/parser/tests/array_pos_err.vv:2:2: error: expression evaluated but not used
+    1 | fn main() {
+    2 |     '' in []
+      |     ~~~~~~~~
+    3 | }

vlib/v/parser/tests/array_pos_err.vv

@@ -0,0 +1,3 @@
+fn main() {
+	'' in []
+}