Moustache: empty comments cause parsing error

[kjessup]

The following works: {{% handler:FAHandler}}{{! This is the moustache template file }}{"resultSets":[{{#resultSets}}{"time":"{{time}}","lat":{{lat}},"long":{{long}} }{{^last}},{{/last}}{{/resultSets}}]}

While this causes parsing problems:

{{% handler:FAHandler}}{{!

}}{"resultSets":[{{#resultSets}}{"time":"{{time}}","lat":{{lat}},"long":{{long}} }{{^last}},{{/last}}{{/resultSets}}]}

The system skips the closing empty comment delimiters.

[SeanStephens]

It's pronounced "Mustache".

I'll let myself out.

[C0deH4cker]

I believe this comes from the code that tries to trim trailing whitespace in Mustache tag names, which doesn't check if there actually are any unicode scalars before using them: https://github.com/PerfectlySoft/Perfect/blob/master/PerfectLib/Mustache.swift#L740