[airspeedswift]

I assure you, every inch of the interpreter code has been stared at by humans, a lot. TBH even the assembly generated by it has.

[ahartmetz]

All 150 kloc in six months by two people? Actually, it sounds like way too much code for the task unless 70+% of it is tests.

[dcrazy]

> By the end of the project, we wrote nearly four times as many lines of test code as we wrote for the Swift interpreter itself.