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Ran 28 Jul 2020 02:27PM UTC

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Committed 28 Jul 2020 02:23PM UTC coverage: 75.679% (-0.01%) from 75.69%

Job # GO111MODULE=on CONTEXT=abs

Build Type

push

travis-ci-com

Committed by

odino

Commit Message

Parsing negative numbers a-la ruby, closes #383 and #382

This bugfix introduces negative numbers into our parser:
before, -10 would be parsed as (minus, number) whereas
right now it's going to be parsed as (number) only.

This fixes a bug with precedences, where `-1.str()`
would be parsed as (-, (1, str)), leading to first
calling the str method on the positive number, then
applying the minus.

Before:

```
⧐  -1.234.str()
ERROR: unknown operator: -STRING
	[1:1]	-1.234.str()

```

After:

```
⧐  -1.234.str()
-1.234
```

If a space is found between the minus and the number,
the old parsing mechanism still applies.

I found inspiration in Ruby, where:

```
$ - 1.to_s()
-@: undefined method `-@' for "1":String

$-1.to_s()
-1

$ -10.3.floor()
-11

$ - 10.3.floor()
-10
```

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