checker: fix or block endwiths expr (fix #25329) (#25667)

Author: kbkpbot

vlib/v/checker/checker.v

@@ -2928,7 +2928,11 @@ fn (mut c Checker) stmts_ending_with_expression(mut stmts []ast.Stmt, expected_o
 			unreachable = stmt.pos
 		}
 		prev_expected_or_type := c.expected_or_type
-		c.expected_or_type = expected_or_type
+		c.expected_or_type = if c.is_last_stmt {
+			expected_or_type
+		} else {
+			ast.void_type
+		}
 		c.stmt(mut stmt)
 		c.expected_or_type = prev_expected_or_type
 		if !c.inside_anon_fn && c.in_for_count > 0 && stmt is ast.BranchStmt

vlib/v/tests/or_block_endwiths_expr_test.v

@@ -0,0 +1,20 @@
+fn some_fn(text string) string {
+	mut some_map := map[string]string{}
+
+	key := ''
+	found := some_map[key] or {
+		if true {
+			if true {
+			} else {
+			}
+		} else {
+		}
+
+		'no'
+	}
+	return found
+}
+
+fn test_or_block_endwiths_expr() {
+	assert some_fn('abc abc') == 'no'
+}