Daniel Martín e66095b10a [Parser] Support "<" unary operator in #if swift() expressions ...

Until now, only ">=" was supported in #if swift() expressions, for example:

```#if swift(>=2.1)
```#endif

This means that if we want to evaluate code only when the language version is
less than a particular version we need to do the following:

```#if !swift(>=2.1)
```#endif

An alernative to make this more readable (the "!" can be easily missed in a code
review) is to introduce another supported unary operator, "<". The previous
example could be rewritten like this:

```#if swift(<2.1)
```#endif

This commit adds support for that unary operator, along with some tests.

2018-08-02 20:35:58 +02:00

2.4 KiB

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