exceptiong expressions in single child fixing. also be aware to compare basic type but not composite type in bool expressions.
exceptiong expressions in single child fixing. also be aware to compare basic type but not composite type in bool expressions.

Signed-off-by: Yulong Bai <7bf5b9e03b9dce613c6ff4ffec57cbbbb5761d53@stud.ntnu.no>
superboy0712/complier_construction,superboy0712/complier_construction,superboy0712/complier_construction,superboy0712/complier_construction