checker: fix unchecked optional in match condition (#10041)

vlib/v/checker/checker.v

@@ -5206,6 +5206,7 @@ pub fn (mut c Checker) match_expr(mut node ast.MatchExpr) ast.Type {
 	// since it is used in c.match_exprs() it saves checking twice
 	node.cond_type = c.table.mktyp(cond_type)
 	c.ensure_type_exists(node.cond_type, node.pos) or { return ast.void_type }
+	c.check_expr_opt_call(node.cond, cond_type)
 	cond_type_sym := c.table.get_type_symbol(cond_type)
 	if cond_type_sym.kind !in [.interface_, .sum_type] {
 		node.is_sum_type = false

vlib/v/checker/tests/optional_fn_err.out

@@ -151,10 +151,18 @@ vlib/v/checker/tests/optional_fn_err.vv:69:18: error: bar() returns an option, s
    69 |     println(arr.any(bar(true)))
       |                     ~~~~~~~~~
    70 |     println(arr.all(bar(true)))
-   71 | }
+   71 |
 vlib/v/checker/tests/optional_fn_err.vv:70:18: error: bar() returns an option, so it should have either an `or {}` block, or `?` at the end
    68 |     println(arr.filter(bar(true)))
    69 |     println(arr.any(bar(true)))
    70 |     println(arr.all(bar(true)))
       |                     ~~~~~~~~~
-   71 | }
+   71 | 
+   72 |     match bar(0) {
+vlib/v/checker/tests/optional_fn_err.vv:72:8: error: bar() returns an option, so it should have either an `or {}` block, or `?` at the end
+   70 |     println(arr.all(bar(true)))
+   71 | 
+   72 |     match bar(0) {
+      |           ~~~~~~
+   73 |         0 { }
+   74 |         else { }

vlib/v/checker/tests/optional_fn_err.vv

@@ -68,4 +68,9 @@ fn main() {
 	println(arr.filter(bar(true)))
 	println(arr.any(bar(true)))
 	println(arr.all(bar(true)))
+
+	match bar(0) {
+		0 { }
+		else { }
+	}
 }