[viralsink]

Lambdas are not fully equivalent since return statements in statement expressions will return at the function level, whereas return statements in lambdas will only return at the lambda level.

[quibono]

Just for clarity, since I didn't understand on first reading.

    int foo() {
    int result = ({ 
        if (some_condition) 
            return -1;  // This returns from foo(), not just the statement expression
        42; 
    });
    // This line might never be reached
}