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Document whitespace rules for keyword syntax #12773

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Jul 8, 2023
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Document whitespace rules for keyword syntax #12773

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2 changes: 2 additions & 0 deletions lib/elixir/pages/references/syntax-reference.md
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Expand Up @@ -470,6 +470,8 @@ Atoms with foreign characters, such as whitespace, must be wrapped in quotes. Th

Remember that, because lists and two-element tuples are quoted literals, by definition keywords are also literals (in fact, the only reason tuples with two elements are quoted literals is to support keywords as literals).

In order to be valid keyword syntax, `:` cannot be preceded by any whitespace (`foo : 1` is invalid) and has to be followed by whitespace (`foo:1` is invalid).

### Keywords as last arguments

Elixir also supports a syntax where if the last argument of a call is a keyword list then the square brackets can be skipped. This means that the following:
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