Possible lexing error?

[Dave Thomas]

iex(13)> %W{the c#{'a'}t sat on the mat}

** (SyntaxError) iex:13: unexpected token: }

Dave

[Alexei Sholik]

iex(1)> %W/the c#{'a'}t sat on the mat/
["the","c\#{'a'}t","sat","on","the","mat"]

iex(2)> %w(the c#{'a'}t sat on the mat)
["the","cat","sat","on","the","mat"]

You can use arbitrary brackets as sigil delimiters.

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Best regards
Alexei Sholik

[Yurii Rashkovskii]

I think José was going to fix this (extra bracket openings within a sigil). José?

[José Valim]

I have tried once and failed miserably.

I can give it another try but it is harder than it looks like. :)

[Alexei Sholik]

In addition to my previous reply. Here's the full story: https://github.com/elixir-lang/elixir/blob/master/lib/elixir/src/elixir_tokenizer.erl#L135

The first clause deals with """ and ''' syntax (hence [$%,S,H,H,H|T] as the first arg).

The second clause deals with all other delimiters. It only requires the delimiter to be not(?is_identifier(H)), not(?is_terminator(H)) (https://github.com/elixir-lang/elixir/blob/master/lib/elixir/include/elixir.hrl#L67). So, apart from paired delimiters ( [], (), {}, <>) you can also use things like /, |, ", ^, %, etc.