### Compilation failed:

error: 3: missing loop expression
void no_expression() { for (int i = 0; i < 1;) {} }
                                             ^
error: 5: invalid operator in loop expression
void expression_equals()     { for (int i = 0; i < 1; i = 1) {} }
                                                      ^^^^^
error: 6: loop index must be modified by a constant expression
void expression_equal_plus() { for (int i = 0; i < 1; i = i + 1) {} }
                                                      ^^^^^^^^^
error: 7: invalid operator in loop expression
void expression_times_eq()   { for (int i = 1; i < 2; i *= 2) {} }
                                                      ^^^^^^
error: 8: invalid operator in loop expression
void expression_bad_unary()  { for (int i = 0; i < 1; -i) {} }
                                                      ^^
error: 12: loop index must be modified by a constant expression
void expression_uniform_val()    { for (int i = 0; i < 1; i += u) {} }
                                                          ^^^^^^
error: 13: loop index must be modified by a constant expression
void expression_param_val(int p) { for (int i = 0; i < 1; i += p) {} }
                                                          ^^^^^^
7 errors