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Add line numbers to error messages #919

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merged 3 commits into from
Apr 30, 2019
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Gabriella439
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Fixes #905

For example, this file:

[ 1
, 2
, 3
, Bool

+ 1
]

... now produces this error message:

Use "dhall --explain" for detailed errors

↳ ./example.dhall

Error: ❰+❱ only works on ❰Natural❱s

4:   Bool
5:
6:
7:
8:
9: + 1

/Users/gabriel/proj/dhall-haskell/dhall/example.dhall:4:3

Fixes #905

For example, this file:

```haskell
[ 1
, 2
, 3
, Bool

+ 1
]
```

... now produces this error message:

```
Use "dhall --explain" for detailed errors

↳ ./example.dhall

Error: ❰+❱ only works on ❰Natural❱s

4:   Bool
5:
6:
7:
8:
9: + 1

/Users/gabriel/proj/dhall-haskell/dhall/example.dhall:4:3
```
@Gabriella439 Gabriella439 merged commit 6d510ee into master Apr 30, 2019
@Gabriella439 Gabriella439 deleted the gabriel/line_numbers branch April 30, 2019 22:31
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Improve error messages by adding line numbers
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