18 lines
308 B
Text
18 lines
308 B
Text
new_frontend
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-- Macro for the `syntax` category
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macro "many " x:stx : stx => `(stx| ($x)*)
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syntax "sum! " (many term:max) : term
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macro_rules
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| `(sum! $x*) => do
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let r ← `(0)
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x.foldlM (fun r elem => `($r + $elem)) r
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#check sum! 1 2 3
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#eval sum! 1 2 3
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#check sum!
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theorem ex : sum! 1 2 3 = 6 :=
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rfl
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