Exponential operator in if condition is not transpiled

[teppeis]

Original source code:

if (2 ** 3 > 0) { alert('test'); }

Expected transpiled code:

0 < Math.pow(2, 3) && alert("test");

Actual result

0 < 2 ** 3 && alert("test");

Same result in ternary operator.

---

Also, it throws an error in Advanced Optimization.

JSC_INTERNAL_ERROR_UNEXPECTED_TOKEN: Internal Error: TypeCheck doesn't know how to handle EXPONENT at line 1 character 4
if (2 ** 3 > 0) { alert('test'); }
    ^

---

If another exponential operator is in body, they are transpiled.
Original:

if (2 ** 3 > 0) { alert(2 ** 3); }

Transpiled:

0 < Math.pow(2, 3) && alert(Math.pow(2, 3));

[MatrixFrog]

I can't seem to repro this with the compiler jar so this seems to be a quirk of the webservice. Will take a look.

[teppeis]

@MatrixFrog see this repo for repro https://github.com/teppeis-sandbox/closure-compiler-repro-2821

[brad4d]

@teppeis I've reproduced this in the unit test. I'm debugging it now.

[brad4d]

Even simpler repro

(2 ** 3) / 3;

Looks like the root cause is in IRFactory.
It fails to record that the exponent operator is used in some cases.

[brad4d]

correction to repro
2 ** 3 > 3

[brad4d]

fix sent for internal review

[teppeis]

@MatrixFrog @brad4d thanks!