Can I create a match against a generic type that implements Pattern?

Question

I think this might work if I can work out the lifetime notation, am I wrong?

pub fn from<T:Pattern>(from: T) -> Result<Tag, &'static str> { match from { 'A'|"A" => Ok(Tag::ChA), 'B'|"B" => Ok(Tag::ChB), 'C'|"C" => Ok(Tag::ChC), 'D'|"D" => Ok(Tag::ChD), 'T'|"Tmpr" => Ok(Tag::Tmpr), 'Y'|"Batt" => Ok(Tag::Batt), 'L'|"Acc" => Ok(Tag::Acc), _ => Err("Error: unknown channel"), } }

Shepmaster · Accepted Answer · 2016-02-28 22:48:00Z

Matching only works with concrete types, so the answer is no. Nothing is known about the type T here except that we can call the methods defined in Pattern on it (which are for searching in a string).

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Can I create a match against a generic type that implements Pattern?

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