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precedence-aware expression emission only inserts parentheses when the
child binds more loosely than the parent expects.
`**` has no c equivalent and is routed through the integer-power
runtime helper, with right-associative chaining preserved by the
recursive expansion of the call arguments.

<<<

main = fun () {
    var a int = 1 + 2 * 3
    var b int = (1 + 2) * 3
    var c int = 10 - 4 - 1
    var d int = 10 - (4 - 1)
    var e int = -1 + 2
    var f bool = a == b && c != 0 || d > 0
    var g int = 2 ** 10
    var h int = 2 ** 2 ** 3
    var i int = 1 + 2 ** 3
}

>>>

#include "core.c"
void catskill_main(void);
void catskill_main(void) {
    integer a = 1 + 2 * 3;
    integer b = (1 + 2) * 3;
    integer c = 10 - 4 - 1;
    integer d = 10 - (4 - 1);
    integer e = -1 + 2;
    bool f = a == b && c != 0 || d > 0;
    integer g = pow_integer(2, 10);
    integer h = pow_integer(2, pow_integer(2, 3));
    integer i = 1 + pow_integer(2, 3);
}
#include "runtime.c"