checker: check for unwrapped results in map keys and vals

vlib/v/checker/containers.v

@@ -517,6 +517,8 @@ fn (mut c Checker) map_init(mut node ast.MapInit) ast.Type {
 			if node.keys.len == 1 && map_val_type == ast.none_type {
 				c.error('map value cannot be only `none`', node.vals[0].pos())
 			}
+			c.check_expr_option_or_result_call(key_, map_key_type)
+			c.check_expr_option_or_result_call(val_, map_val_type)
 		}
 		map_key_type = c.unwrap_generic(map_key_type)
 		map_val_type = c.unwrap_generic(map_val_type)
@@ -539,6 +541,8 @@ fn (mut c Checker) map_init(mut node ast.MapInit) ast.Type {
 			val_type := c.expr(mut val)
 			node.val_types << val_type
 			val_type_sym := c.table.sym(val_type)
+			c.check_expr_option_or_result_call(key, key_type)
+			c.check_expr_option_or_result_call(val, val_type)
 			if !c.check_types(key_type, map_key_type)
 				|| (i == 0 && key_type.is_number() && map_key_type.is_number()
 				&& map_key_type != ast.mktyp(key_type)) {

vlib/v/checker/tests/map_key_val_or_not_progagate_err.out

@@ -0,0 +1,21 @@
+vlib/v/checker/tests/map_key_val_or_not_progagate_err.vv:6:7: error: f() returns `!int`, so it should have either an `or {}` block, or `!` at the end
+    4 | 
+    5 | a := {
+    6 |     2:   f() // first value
+      |          ~~~
+    7 |     3:   f() // second value
+    8 |     f(): 1
+vlib/v/checker/tests/map_key_val_or_not_progagate_err.vv:7:7: error: f() returns `!int`, so it should have either an `or {}` block, or `!` at the end
+    5 | a := {
+    6 |     2:   f() // first value
+    7 |     3:   f() // second value
+      |          ~~~
+    8 |     f(): 1
+    9 | }
+vlib/v/checker/tests/map_key_val_or_not_progagate_err.vv:8:2: error: f() returns `!int`, so it should have either an `or {}` block, or `!` at the end
+    6 |     2:   f() // first value
+    7 |     3:   f() // second value
+    8 |     f(): 1
+      |     ~~~
+    9 | }
+   10 |

vlib/v/checker/tests/map_key_val_or_not_progagate_err.vv

@@ -0,0 +1,11 @@
+fn f() !int {
+	return 42
+}
+
+a := {
+	2:   f() // first value
+	3:   f() // second value
+	f(): 1
+}
+
+println(a)