### Compilation failed:

error: 3: missing condition
void no_condition() { for (int i = 0;;i++) {} }
                                     ^
error: 5: invalid condition
void unary_cond_op()   { for (int i = 0; !(i > 1); ++i) {} }
                                         ^^^^^^^^
error: 6: invalid condition
void implict_cond_op() { for (int i = 1; bool(i); --i) {} }
                                         ^^^^^^^
error: 7: expected loop index on left hand side of condition
void complex_cond_op() { for (int i = 0; i < 1 && i < 2; ++i) {} }
                                         ^^^^^^^^^^^^^^
error: 9: expected loop index on left hand side of condition
void cond_wrong_var()  { int j = 0; for (int i = 0; j < 1; ++i) {} }
                                                    ^^^^^
error: 10: expected loop index on left hand side of condition
void cond_wrong_side() { for (int i = 0; 1 > i; ++i) {} }
                                         ^^^^^
error: 11: expected loop index on left hand side of condition
void cond_index_cast() { for (int i = 0; float(i) < 1.5; ++i) {} }
                                         ^^^^^^^^^^^^^^
error: 15: loop index must be compared with a constant expression
void cond_uniform_val()    { for (int i = 0; i < u; ++i) {} }
                                             ^^^^^
error: 16: loop index must be compared with a constant expression
void cond_param_val(int p) { for (int i = 0; i < p; ++i) {} }
                                             ^^^^^
9 errors