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Added item "Semicolons can't replace newlines" #470

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14 changes: 14 additions & 0 deletions language/Differences-from-Haskell.md
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Expand Up @@ -364,6 +364,20 @@ For `error`, you can use `Effect.Exception.Unsafe.unsafeThrow`, in the `purescri

Although note that these might have different behaviour to the Haskell versions due to PureScript's strictness.

## Semicolons can't replace newlines

In Haskell, an expression that normally uses multiple lines can be written in one line by substituting semicolons for newlines. For example, in Haskell,
```purescript
do
x <- Just 2
pure (1 + x)
```
can be written as
```purescript
do ; x <- Just 2 ; pure 2
```
This isn't allowed in Purescript; the `do` expression has to be written on multiple lines.

## Documentation comments

When writing documentation, the pipe character `|` must appear at the start of every comment line, not just the first. See [the documentation for doc-comments](Syntax.md#comments) for more details.
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