parser: `expression evaluated but not used` error

vlib/v/checker/tests/add_op_wrong_left_type_err_a.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/add_op_wrong_left_type_err_a.v:3:5: error: mismatched types `Aaa` and `any_int`
+vlib/v/checker/tests/add_op_wrong_left_type_err_a.v:3:13: error: mismatched types `Aaa` and `any_int`
     1 | struct Aaa{}
     2 | fn main() {
-    3 |     Aaa{} + 10
-      |     ~~~~~
+    3 |     println(Aaa{} + 10)
+      |             ~~~~~
     4 | }

vlib/v/checker/tests/add_op_wrong_left_type_err_a.vv

@@ -1,4 +1,4 @@
 struct Aaa{}
 fn main() {
-    Aaa{} + 10
+    println(Aaa{} + 10)
 }

vlib/v/checker/tests/add_op_wrong_left_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/add_op_wrong_left_type_err_b.v:2:5: error: mismatched types `array_int` and `any_int` 
+vlib/v/checker/tests/add_op_wrong_left_type_err_b.v:2:13: error: mismatched types `array_int` and `any_int`
     1 | fn main() {
-    2 |     [1,2,3] + 10
-      |     ~~~~~~~
+    2 |     println([1,2,3] + 10)
+      |             ~~~~~~~
     3 | }

vlib/v/checker/tests/add_op_wrong_left_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-    [1,2,3] + 10
+    println([1,2,3] + 10)
 }

vlib/v/checker/tests/add_op_wrong_left_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/add_op_wrong_left_type_err_c.v:3:5: error: mismatched types `map_string_int` and `any_int` 
+vlib/v/checker/tests/add_op_wrong_left_type_err_c.v:3:13: error: mismatched types `map_string_int` and `any_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     a + 10
-      |     ^
+    3 |     println(a + 10)
+      |             ^
     4 | }

vlib/v/checker/tests/add_op_wrong_left_type_err_c.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-    a + 10
+    println(a + 10)
 }

vlib/v/checker/tests/add_op_wrong_right_type_err_a.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/add_op_wrong_right_type_err_a.v:3:10: error: mismatched types `any_int` and `Aaa`
+vlib/v/checker/tests/add_op_wrong_right_type_err_a.v:3:18: error: mismatched types `any_int` and `Aaa`
     1 | struct Aaa{}
     2 | fn main() {
-    3 |     10 + Aaa{}
-      |          ~~~~~
+    3 |     println(10 + Aaa{})
+      |                  ~~~~~
     4 | }

vlib/v/checker/tests/add_op_wrong_right_type_err_a.vv

@@ -1,4 +1,4 @@
 struct Aaa{}
 fn main() {
-    10 + Aaa{}
+    println(10 + Aaa{})
 }

vlib/v/checker/tests/add_op_wrong_right_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/add_op_wrong_right_type_err_b.v:2:10: error: mismatched types `any_int` and `array_int` 
+vlib/v/checker/tests/add_op_wrong_right_type_err_b.v:2:18: error: mismatched types `any_int` and `array_int`
     1 | fn main() {
-    2 |     10 + [1,2,3]
-      |          ~~~~~~~
+    2 |     println(10 + [1,2,3])
+      |                  ~~~~~~~
     3 | }

vlib/v/checker/tests/add_op_wrong_right_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-    10 + [1,2,3]
+    println(10 + [1,2,3])
 }

vlib/v/checker/tests/add_op_wrong_right_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/add_op_wrong_right_type_err_c.v:3:10: error: mismatched types `any_int` and `map_string_int` 
+vlib/v/checker/tests/add_op_wrong_right_type_err_c.v:3:18: error: mismatched types `any_int` and `map_string_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     10 + a
-      |          ^
+    3 |     println(10 + a)
+      |                  ^
     4 | }

vlib/v/checker/tests/add_op_wrong_right_type_err_c.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-    10 + a
+    println(10 + a)
 }

vlib/v/checker/tests/bit_op_wrong_left_type_err.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/bit_op_wrong_left_type_err.v:2:2: error: left type of `&` cannot be non-integer type any_float 
+vlib/v/checker/tests/bit_op_wrong_left_type_err.v:2:10: error: left type of `&` cannot be non-integer type any_float
     1 | fn main() {
-    2 |     0.5 & 1
-      |     ~~~
+    2 |     println(0.5 & 1)
+      |             ~~~
     3 | }

vlib/v/checker/tests/bit_op_wrong_left_type_err.vv

@@ -1,3 +1,3 @@
 fn main() {
-	0.5 & 1
+	println(0.5 & 1)
 }

vlib/v/checker/tests/bit_op_wrong_right_type_err.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/bit_op_wrong_right_type_err.v:2:6: error: right type of `|` cannot be non-integer type any_float 
+vlib/v/checker/tests/bit_op_wrong_right_type_err.v:2:14: error: right type of `|` cannot be non-integer type any_float
     1 | fn main() {
-    2 |     1 | 0.5
-      |         ~~~
+    2 |     println(1 | 0.5)
+      |                 ~~~
     3 | }

vlib/v/checker/tests/bit_op_wrong_right_type_err.vv

@@ -1,3 +1,3 @@
 fn main() {
-	1 | 0.5
+	println(1 | 0.5)
 }

vlib/v/checker/tests/div_op_wrong_left_type_err_a.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/div_op_wrong_left_type_err_a.v:3:5: error: mismatched types `Aaa` and `any_int`
+vlib/v/checker/tests/div_op_wrong_left_type_err_a.v:3:13: error: mismatched types `Aaa` and `any_int`
     1 | struct Aaa{}
     2 | fn main() {
-    3 |     Aaa{} / 10
-      |     ~~~~~
+    3 |     println(Aaa{} / 10)
+      |             ~~~~~
     4 | }

vlib/v/checker/tests/div_op_wrong_left_type_err_a.vv

@@ -1,4 +1,4 @@
 struct Aaa{}
 fn main() {
-    Aaa{} / 10
+    println(Aaa{} / 10)
 }

vlib/v/checker/tests/div_op_wrong_left_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/div_op_wrong_left_type_err_b.v:2:5: error: mismatched types `array_int` and `any_int` 
+vlib/v/checker/tests/div_op_wrong_left_type_err_b.v:2:13: error: mismatched types `array_int` and `any_int`
     1 | fn main() {
-    2 |     [1,2,3] / 10
-      |     ~~~~~~~
+    2 |     println([1,2,3] / 10)
+      |             ~~~~~~~
     3 | }

vlib/v/checker/tests/div_op_wrong_left_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-    [1,2,3] / 10
+    println([1,2,3] / 10)
 }

vlib/v/checker/tests/div_op_wrong_left_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/div_op_wrong_left_type_err_c.v:3:5: error: mismatched types `map_string_int` and `any_int` 
+vlib/v/checker/tests/div_op_wrong_left_type_err_c.v:3:13: error: mismatched types `map_string_int` and `any_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     a / 10
-      |     ^
+    3 |     println(a / 10)
+      |             ^
     4 | }

vlib/v/checker/tests/div_op_wrong_left_type_err_c.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-    a / 10
+    println(a / 10)
 }

vlib/v/checker/tests/div_op_wrong_right_type_err_a.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/div_op_wrong_right_type_err_a.v:3:10: error: mismatched types `any_int` and `Aaa`
+vlib/v/checker/tests/div_op_wrong_right_type_err_a.v:3:18: error: mismatched types `any_int` and `Aaa`
     1 | struct Aaa{}
     2 | fn main() {
-    3 |     10 / Aaa{}
-      |          ~~~~~
+    3 |     println(10 / Aaa{})
+      |                  ~~~~~
     4 | }

vlib/v/checker/tests/div_op_wrong_right_type_err_a.vv

@@ -1,4 +1,4 @@
 struct Aaa{}
 fn main() {
-    10 / Aaa{}
+    println(10 / Aaa{})
 }

vlib/v/checker/tests/div_op_wrong_right_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/div_op_wrong_right_type_err_b.v:2:10: error: mismatched types `any_int` and `array_int` 
+vlib/v/checker/tests/div_op_wrong_right_type_err_b.v:2:18: error: mismatched types `any_int` and `array_int`
     1 | fn main() {
-    2 |     10 / [1,2,3]
-      |          ~~~~~~~
+    2 |     println(10 / [1,2,3])
+      |                  ~~~~~~~
     3 | }

vlib/v/checker/tests/div_op_wrong_right_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-    10 / [1,2,3]
+    println(10 / [1,2,3])
 }

vlib/v/checker/tests/div_op_wrong_right_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/div_op_wrong_right_type_err_c.v:3:10: error: mismatched types `any_int` and `map_string_int` 
+vlib/v/checker/tests/div_op_wrong_right_type_err_c.v:3:18: error: mismatched types `any_int` and `map_string_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     10 / a
-      |          ^
+    3 |     println(10 / a)
+      |                  ^
     4 | }

vlib/v/checker/tests/div_op_wrong_right_type_err_c.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-    10 / a
+    println(10 / a)
 }

vlib/v/checker/tests/minus_op_wrong_left_type_err_a.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/minus_op_wrong_left_type_err_a.v:3:5: error: mismatched types `Aaa` and `any_int`
+vlib/v/checker/tests/minus_op_wrong_left_type_err_a.v:3:13: error: mismatched types `Aaa` and `any_int`
     1 | struct Aaa{}
     2 | fn main() {
-    3 |     Aaa{} - 10
-      |     ~~~~~
+    3 |     println(Aaa{} - 10)
+      |             ~~~~~
     4 | }

vlib/v/checker/tests/minus_op_wrong_left_type_err_a.vv

@@ -1,4 +1,4 @@
 struct Aaa{}
 fn main() {
-    Aaa{} - 10
+    println(Aaa{} - 10)
 }

vlib/v/checker/tests/minus_op_wrong_left_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/minus_op_wrong_left_type_err_b.v:2:5: error: mismatched types `array_int` and `any_int` 
+vlib/v/checker/tests/minus_op_wrong_left_type_err_b.v:2:13: error: mismatched types `array_int` and `any_int`
     1 | fn main() {
-    2 |     [1,2,3] - 10
-      |     ~~~~~~~
+    2 |     println([1,2,3] - 10)
+      |             ~~~~~~~
     3 | }

vlib/v/checker/tests/minus_op_wrong_left_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-    [1,2,3] - 10
+    println([1,2,3] - 10)
 }

vlib/v/checker/tests/minus_op_wrong_left_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/minus_op_wrong_left_type_err_c.v:3:5: error: mismatched types `map_string_int` and `any_int` 
+vlib/v/checker/tests/minus_op_wrong_left_type_err_c.v:3:13: error: mismatched types `map_string_int` and `any_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     a - 10
-      |     ^
+    3 |     println(a - 10)
+      |             ^
     4 | }

vlib/v/checker/tests/minus_op_wrong_left_type_err_c.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-    a - 10
+    println(a - 10)
 }

vlib/v/checker/tests/minus_op_wrong_right_type_err_a.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/minus_op_wrong_right_type_err_a.v:3:10: error: mismatched types `any_int` and `Aaa`
+vlib/v/checker/tests/minus_op_wrong_right_type_err_a.v:3:18: error: mismatched types `any_int` and `Aaa`
     1 | struct Aaa{}
     2 | fn main() {
-    3 |     10 - Aaa{}
-      |          ~~~~~
+    3 |     println(10 - Aaa{})
+      |                  ~~~~~
     4 | }

vlib/v/checker/tests/minus_op_wrong_right_type_err_a.vv

@@ -1,4 +1,4 @@
 struct Aaa{}
 fn main() {
-    10 - Aaa{}
+    println(10 - Aaa{})
 }

vlib/v/checker/tests/minus_op_wrong_right_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/minus_op_wrong_right_type_err_b.v:2:10: error: mismatched types `any_int` and `array_int` 
+vlib/v/checker/tests/minus_op_wrong_right_type_err_b.v:2:18: error: mismatched types `any_int` and `array_int`
     1 | fn main() {
-    2 |     10 - [1,2,3]
-      |          ~~~~~~~
+    2 |     println(10 - [1,2,3])
+      |                  ~~~~~~~
     3 | }

vlib/v/checker/tests/minus_op_wrong_right_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-    10 - [1,2,3]
+    println(10 - [1,2,3])
 }

vlib/v/checker/tests/minus_op_wrong_right_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/minus_op_wrong_right_type_err_c.v:3:10: error: mismatched types `any_int` and `map_string_int` 
+vlib/v/checker/tests/minus_op_wrong_right_type_err_c.v:3:18: error: mismatched types `any_int` and `map_string_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     10 - a
-      |          ^
+    3 |     println(10 - a)
+      |                  ^
     4 | }

vlib/v/checker/tests/minus_op_wrong_right_type_err_c.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-    10 - a
+    println(10 - a)
 }

vlib/v/checker/tests/mod_op_wrong_left_type_err_a.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/mod_op_wrong_left_type_err_a.v:2:2: error: float modulo not allowed, use math.fmod() instead 
+vlib/v/checker/tests/mod_op_wrong_left_type_err_a.v:2:10: error: float modulo not allowed, use math.fmod() instead
     1 | fn main() {
-    2 |     0.5 % 1
-      |     ~~~
+    2 |     println(0.5 % 1)
+      |             ~~~
     3 | }

vlib/v/checker/tests/mod_op_wrong_left_type_err_a.vv

@@ -1,3 +1,3 @@
 fn main() {
-	0.5 % 1
+	println(0.5 % 1)
 }

vlib/v/checker/tests/mod_op_wrong_left_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/mod_op_wrong_left_type_err_b.v:2:2: error: mismatched types `array_int` and `any_int` 
+vlib/v/checker/tests/mod_op_wrong_left_type_err_b.v:2:10: error: mismatched types `array_int` and `any_int`
     1 | fn main() {
-    2 |     [1,2,3] % 1
-      |     ~~~~~~~
+    2 |     println([1,2,3] % 1)
+      |             ~~~~~~~
     3 | }

vlib/v/checker/tests/mod_op_wrong_left_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-	[1,2,3] % 1
+	println([1,2,3] % 1)
 }

vlib/v/checker/tests/mod_op_wrong_left_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/mod_op_wrong_left_type_err_c.v:4:2: error: mismatched types `Aaa` and `any_int`
+vlib/v/checker/tests/mod_op_wrong_left_type_err_c.v:4:10: error: mismatched types `Aaa` and `any_int`
     2 | fn main() {
     3 |     a := Aaa{}
-    4 |     a % 1
-      |     ^
+    4 |     println(a % 1)
+      |             ^
     5 | }

vlib/v/checker/tests/mod_op_wrong_left_type_err_c.vv

@@ -1,5 +1,5 @@
 struct Aaa{}
 fn main() {
 	a := Aaa{}
-	a % 1
+	println(a % 1)
 }

vlib/v/checker/tests/mod_op_wrong_left_type_err_d.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/mod_op_wrong_left_type_err_d.v:3:2: error: mismatched types `map_string_int` and `any_int` 
+vlib/v/checker/tests/mod_op_wrong_left_type_err_d.v:3:10: error: mismatched types `map_string_int` and `any_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     a % 1
-      |     ^
+    3 |     println(a % 1)
+      |             ^
     4 | }

vlib/v/checker/tests/mod_op_wrong_left_type_err_d.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-	a % 1
+	println(a % 1)
 }

vlib/v/checker/tests/mod_op_wrong_right_type_err_a.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/mod_op_wrong_right_type_err_a.v:2:6: error: float modulo not allowed, use math.fmod() instead 
+vlib/v/checker/tests/mod_op_wrong_right_type_err_a.v:2:14: error: float modulo not allowed, use math.fmod() instead
     1 | fn main() {
-    2 |     1 % 0.5
-      |         ~~~
+    2 |     println(1 % 0.5)
+      |                 ~~~
     3 | }

vlib/v/checker/tests/mod_op_wrong_right_type_err_a.vv

@@ -1,3 +1,3 @@
 fn main() {
-	1 % 0.5
+	println(1 % 0.5)
 }

vlib/v/checker/tests/mod_op_wrong_right_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/mod_op_wrong_right_type_err_b.v:2:6: error: mismatched types `any_int` and `array_int` 
+vlib/v/checker/tests/mod_op_wrong_right_type_err_b.v:2:14: error: mismatched types `any_int` and `array_int`
     1 | fn main() {
-    2 |     1 % [1,2,3]
-      |         ~~~~~~~
+    2 |     println(1 % [1,2,3])
+      |                 ~~~~~~~
     3 | }

vlib/v/checker/tests/mod_op_wrong_right_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-	1 % [1,2,3]
+	println(1 % [1,2,3])
 }

vlib/v/checker/tests/mod_op_wrong_right_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/mod_op_wrong_right_type_err_c.v:4:6: error: mismatched types `any_int` and `Aaa`
+vlib/v/checker/tests/mod_op_wrong_right_type_err_c.v:4:14: error: mismatched types `any_int` and `Aaa`
     2 | fn main() {
     3 |     a := Aaa{}
-    4 |     1 % a
-      |         ^
+    4 |     println(1 % a)
+      |                 ^
     5 | }

vlib/v/checker/tests/mod_op_wrong_right_type_err_c.vv

@@ -1,5 +1,5 @@
 struct Aaa{}
 fn main() {
 	a := Aaa{}
-	1 % a
+	println(1 % a)
 }

vlib/v/checker/tests/mod_op_wrong_right_type_err_d.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/mod_op_wrong_right_type_err_d.v:3:6: error: mismatched types `any_int` and `map_string_int` 
+vlib/v/checker/tests/mod_op_wrong_right_type_err_d.v:3:14: error: mismatched types `any_int` and `map_string_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     1 % a
-      |         ^
+    3 |     println(1 % a)
+      |                 ^
     4 | }

vlib/v/checker/tests/mod_op_wrong_right_type_err_d.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-	1 % a
+	println(1 % a)
 }

vlib/v/checker/tests/mul_op_wrong_left_type_err_a.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/mul_op_wrong_left_type_err_a.v:3:5: error: mismatched types `Aaa` and `any_int`
+vlib/v/checker/tests/mul_op_wrong_left_type_err_a.v:3:13: error: mismatched types `Aaa` and `any_int`
     1 | struct Aaa{}
     2 | fn main() {
-    3 |     Aaa{} * 10
-      |     ~~~~~
+    3 |     println(Aaa{} * 10)
+      |             ~~~~~
     4 | }

vlib/v/checker/tests/mul_op_wrong_left_type_err_a.vv

@@ -1,4 +1,4 @@
 struct Aaa{}
 fn main() {
-    Aaa{} * 10
+    println(Aaa{} * 10)
 }

vlib/v/checker/tests/mul_op_wrong_left_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/mul_op_wrong_left_type_err_b.v:2:5: error: mismatched types `array_int` and `any_int` 
+vlib/v/checker/tests/mul_op_wrong_left_type_err_b.v:2:13: error: mismatched types `array_int` and `any_int`
     1 | fn main() {
-    2 |     [1,2,3] * 10
-      |     ~~~~~~~
+    2 |     println([1,2,3] * 10)
+      |             ~~~~~~~
     3 | }

vlib/v/checker/tests/mul_op_wrong_left_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-    [1,2,3] * 10
+    println([1,2,3] * 10)
 }

vlib/v/checker/tests/mul_op_wrong_left_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/mul_op_wrong_left_type_err_c.v:3:5: error: mismatched types `map_string_int` and `any_int` 
+vlib/v/checker/tests/mul_op_wrong_left_type_err_c.v:3:13: error: mismatched types `map_string_int` and `any_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     a * 10
-      |     ^
+    3 |     println(a * 10)
+      |             ^
     4 | }

vlib/v/checker/tests/mul_op_wrong_left_type_err_c.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-    a * 10
+    println(a * 10)
 }

vlib/v/checker/tests/mul_op_wrong_right_type_err_a.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/mul_op_wrong_right_type_err_a.v:3:10: error: mismatched types `any_int` and `Aaa`
+vlib/v/checker/tests/mul_op_wrong_right_type_err_a.v:3:18: error: mismatched types `any_int` and `Aaa`
     1 | struct Aaa{}
     2 | fn main() {
-    3 |     10 * Aaa{}
-      |          ~~~~~
+    3 |     println(10 * Aaa{})
+      |                  ~~~~~
     4 | }

vlib/v/checker/tests/mul_op_wrong_right_type_err_a.vv

@@ -1,4 +1,4 @@
 struct Aaa{}
 fn main() {
-    10 * Aaa{}
+    println(10 * Aaa{})
 }

vlib/v/checker/tests/mul_op_wrong_right_type_err_b.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/mul_op_wrong_right_type_err_b.v:2:10: error: mismatched types `any_int` and `array_int` 
+vlib/v/checker/tests/mul_op_wrong_right_type_err_b.v:2:18: error: mismatched types `any_int` and `array_int`
     1 | fn main() {
-    2 |     10 * [1,2,3]
-      |          ~~~~~~~
+    2 |     println(10 * [1,2,3])
+      |                  ~~~~~~~
     3 | }

vlib/v/checker/tests/mul_op_wrong_right_type_err_b.vv

@@ -1,3 +1,3 @@
 fn main() {
-    10 * [1,2,3]
+    println(10 * [1,2,3])
 }

vlib/v/checker/tests/mul_op_wrong_right_type_err_c.out

@@ -1,6 +1,6 @@
-vlib/v/checker/tests/mul_op_wrong_right_type_err_c.v:3:10: error: mismatched types `any_int` and `map_string_int` 
+vlib/v/checker/tests/mul_op_wrong_right_type_err_c.v:3:18: error: mismatched types `any_int` and `map_string_int`
     1 | fn main() {
     2 |     a := map[string]int
-    3 |     10 * a
-      |          ^
+    3 |     println(10 * a)
+      |                  ^
     4 | }

vlib/v/checker/tests/mul_op_wrong_right_type_err_c.vv

@@ -1,4 +1,4 @@
 fn main() {
 	a := map[string]int
-    10 * a
+    println(10 * a)
 }

vlib/v/checker/tests/rshift_op_wrong_left_type_err.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/rshift_op_wrong_left_type_err.v:2:2: error: cannot shift type any_int into non-integer type any_float 
+vlib/v/checker/tests/rshift_op_wrong_left_type_err.v:2:10: error: cannot shift type any_int into non-integer type any_float
     1 | fn main() {
-    2 |     0.5 >> 1
-      |     ~~~
+    2 |     println(0.5 >> 1)
+      |             ~~~
     3 | }

vlib/v/checker/tests/rshift_op_wrong_left_type_err.vv

@@ -1,3 +1,3 @@
 fn main() {
-	0.5 >> 1
+	println(0.5 >> 1)
 }

vlib/v/checker/tests/rshift_op_wrong_right_type_err.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/rshift_op_wrong_right_type_err.v:2:7: error: cannot shift non-integer type any_float into type any_int 
+vlib/v/checker/tests/rshift_op_wrong_right_type_err.v:2:15: error: cannot shift non-integer type any_float into type any_int
     1 | fn main() {
-    2 |     1 >> 0.5
-      |          ~~~
+    2 |     println(1 >> 0.5)
+      |                  ~~~
     3 | }

vlib/v/checker/tests/rshift_op_wrong_right_type_err.vv

@@ -1,3 +1,3 @@
 fn main() {
-	1 >> 0.5
+	println(1 >> 0.5)
 }

vlib/v/checker/tests/shift_op_wrong_left_type_err.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/shift_op_wrong_left_type_err.v:2:2: error: cannot shift type any_int into non-integer type any_float 
+vlib/v/checker/tests/shift_op_wrong_left_type_err.v:2:10: error: cannot shift type any_int into non-integer type any_float
     1 | fn main() {
-    2 |     0.5 << 1
-      |     ~~~
+    2 |     println(0.5 << 1)
+      |             ~~~
     3 | }

vlib/v/checker/tests/shift_op_wrong_left_type_err.vv

@@ -1,3 +1,3 @@
 fn main() {
-	0.5 << 1
+	println(0.5 << 1)
 }

vlib/v/checker/tests/shift_op_wrong_right_type_err.out

@@ -1,5 +1,5 @@
-vlib/v/checker/tests/shift_op_wrong_right_type_err.v:2:7: error: cannot shift non-integer type any_float into type any_int 
+vlib/v/checker/tests/shift_op_wrong_right_type_err.v:2:15: error: cannot shift non-integer type any_float into type any_int
     1 | fn main() {
-    2 |     1 << 0.5
-      |          ~~~
+    2 |     println(1 << 0.5)
+      |                  ~~~
     3 | }

vlib/v/checker/tests/shift_op_wrong_right_type_err.vv

@@ -1,3 +1,3 @@
 fn main() {
-	1 << 0.5
+	println(1 << 0.5)
 }

vlib/v/fmt/tests/char_literal_backtick_keep.vv

@@ -1,3 +1,3 @@
 fn char_backtick() {
-	`\``
+	println(`\``)
 }

vlib/v/fmt/tests/functions_input.vv

@@ -50,7 +50,7 @@ fn (f Foo) fn_with_optional() ?int {
 	return 40
 }
 
-fn mut_array(a mut []int) {
+fn mut_array(mut a []int) {
 	println(1)
 }
 

vlib/v/fmt/tests/string_quotes_expected.vv

@@ -1,11 +1,11 @@
 fn main() {
-	'Hello world !'
-	'This is correct !'
-	"It's okay"
-	'This is "too"'
+	println('Hello world !')
+	println('This is correct !')
+	println("It's okay")
+	println('This is "too"')
 	// TODO
 	// 'I\'m not correctly formatted' => "I'm not correctly formatted"
 	// "\"Everything on the internet is true\" - Albert Einstein, 1965" => '"Everything on the internet is true" - Albert Einstein, 1965'
-	'I\'m out of idea "_"'
+	println('I\'m out of idea "_"')
 	// "Definitely out \":'(\"" => 'Definitely out ":\'("'
 }

vlib/v/fmt/tests/string_quotes_input.vv

@@ -1,11 +1,11 @@
 fn main() {
-	"Hello world !"
-	'This is correct !'
-	"It's okay"
-	'This is "too"'
+	println("Hello world !")
+	println('This is correct !')
+	println("It's okay")
+	println('This is "too"')
 	// TODO
 	// 'I\'m not correctly formatted' => "I'm not correctly formatted"
 	// "\"Everything on the internet is true\" - Albert Einstein, 1965" => '"Everything on the internet is true" - Albert Einstein, 1965'
-	'I\'m out of idea "_"'
+	println('I\'m out of idea "_"')
 	// "Definitely out \":'(\"" => 'Definitely out ":\'("'
 }

vlib/v/parser/parser.v

@@ -73,7 +73,7 @@ pub fn parse_stmt(text string, table &table.Table, scope &ast.Scope) ast.Stmt {
 	}
 	p.init_parse_fns()
 	p.read_first_token()
-	return p.stmt()
+	return p.stmt(false)
 }
 
 pub fn parse_text(text string, b_table &table.Table, pref &pref.Preferences, scope, global_scope &ast.Scope) ast.File {
@@ -317,7 +317,7 @@ pub fn (mut p Parser) parse_block_no_scope(is_top_level bool) []ast.Stmt {
 	mut stmts := []ast.Stmt{}
 	if p.tok.kind != .rcbr {
 		for {
-			stmts << p.stmt()
+			stmts << p.stmt(is_top_level)
 			// p.warn('after stmt(): tok=$p.tok.str()')
 			if p.tok.kind in [.eof, .rcbr] {
 				break
@@ -464,7 +464,7 @@ pub fn (mut p Parser) top_stmt() ast.Stmt {
 			if p.pref.is_script && !p.pref.is_test {
 				mut stmts := []ast.Stmt{}
 				for p.tok.kind != .eof {
-					stmts << p.stmt()
+					stmts << p.stmt(false)
 				}
 				return ast.FnDecl{
 					name: 'main'
@@ -500,7 +500,7 @@ pub fn (mut p Parser) comment() ast.Comment {
 	}
 }
 
-pub fn (mut p Parser) stmt() ast.Stmt {
+pub fn (mut p Parser) stmt(is_top_level bool) ast.Stmt {
 	p.is_stmt_ident = p.tok.kind == .name
 	match p.tok.kind {
 		.lcbr {
@@ -530,7 +530,7 @@ pub fn (mut p Parser) stmt() ast.Stmt {
 				return p.assign_stmt()
 			} else if p.peek_tok.kind == .comma {
 				// `a, b ...`
-				return p.parse_multi_expr()
+				return p.parse_multi_expr(is_top_level)
 			} else if p.peek_tok.kind == .colon {
 				// `label:`
 				name := p.check_name()
@@ -544,7 +544,7 @@ pub fn (mut p Parser) stmt() ast.Stmt {
 				[.rcbr, .eof] {
 				p.error_with_pos('`$p.tok.lit` evaluated but not used', p.tok.position())
 			}
-			return p.parse_multi_expr()
+			return p.parse_multi_expr(is_top_level)
 		}
 		.comment {
 			return p.comment()
@@ -613,7 +613,7 @@ pub fn (mut p Parser) stmt() ast.Stmt {
 		}
 		// literals, 'if', etc. in here
 		else {
-			return p.parse_multi_expr()
+			return p.parse_multi_expr(is_top_level)
 		}
 	}
 }
@@ -733,11 +733,12 @@ pub fn (mut p Parser) warn_with_pos(s string, pos token.Position) {
 	}
 }
 
-fn (mut p Parser) parse_multi_expr() ast.Stmt {
+fn (mut p Parser) parse_multi_expr(is_top_level bool) ast.Stmt {
 	// in here might be 1) multi-expr 2) multi-assign
 	// 1, a, c ... }       // multi-expression
 	// a, mut b ... :=/=   // multi-assign
 	// collect things upto hard boundaries
+	tok_kind := p.tok.kind
 	mut collected := []ast.Expr{}
 	for {
 		collected << p.expr(0)
@@ -773,6 +774,11 @@ fn (mut p Parser) parse_multi_expr() ast.Stmt {
 			})
 			pos: epos
 		}
+	} else if is_top_level && collected.len > 0 && collected[0] !is ast.AssignExpr &&
+			collected[0] !is ast.CallExpr && collected[0] !is ast.PostfixExpr &&
+			!(collected[0] is ast.InfixExpr && (collected[0] as ast.InfixExpr).op == .left_shift) &&
+			collected[0] !is ast.ComptimeCall && tok_kind !in [.key_if, .key_match] {
+		p.error_with_pos('expression evaluated but not used', collected[0].position())
 	} else {
 		if collected.len == 1 {
 			return ast.ExprStmt{

vlib/v/parser/tests/expr_evaluated_but_not_used_a.out

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

vlib/v/parser/tests/expr_evaluated_but_not_used_a.vv

@@ -0,0 +1,3 @@
+fn main() {
+	'hello'
+}

vlib/v/parser/tests/expr_evaluated_but_not_used_b.out

@@ -0,0 +1,5 @@
+vlib/v/parser/tests/expr_evaluated_but_not_used_b.v:2:2: error: expression evaluated but not used
+    1 | fn main() {
+    2 |     22
+      |     ~~
+    3 | }

vlib/v/parser/tests/expr_evaluated_but_not_used_b.vv

@@ -0,0 +1,3 @@
+fn main() {
+	22
+}

vlib/v/parser/tests/expr_evaluated_but_not_used_c.out

@@ -0,0 +1,7 @@
+vlib/v/parser/tests/expr_evaluated_but_not_used_c.v:3:5: error: expression evaluated but not used
+    1 | fn main() {
+    2 |     a := 10
+    3 |     `b`
+      |     ~~~
+    4 |     println(a)
+    5 | }

vlib/v/parser/tests/expr_evaluated_but_not_used_c.vv

@@ -0,0 +1,5 @@
+fn main() {
+    a := 10
+    `b`
+    println(a)
+}

vlib/v/parser/tests/expr_evaluated_but_not_used_d.out

@@ -0,0 +1,7 @@
+vlib/v/parser/tests/expr_evaluated_but_not_used_d.v:4:5: error: expression evaluated but not used
+    2 |     a := 1
+    3 |     b := 2
+    4 |     a+b
+      |     ~~~
+    5 |     println(a*b)
+    6 | }

vlib/v/parser/tests/expr_evaluated_but_not_used_d.vv

@@ -0,0 +1,6 @@
+fn main() {
+    a := 1
+    b := 2
+    a+b
+    println(a*b)
+}