This code attempts to add an integer and a float, which is not possible in C++. Sema detects this error during the semantic analysis phase and flags it as a compilation error. Example 2: Checking for variable scopec++ void foo() { int x; } int main() { x = 5; // Error: variable x is not in scope return 0; } ``` In this example, the variable x is declared within the function foo and is not accessible outside of it. Attempting to access it outside of the function results in a compilation error detected by Sema. Package library: Sema is not a standalone package library, but rather a component of the LLVM compiler infrastructure.