f36fca875c
Comment from parser.h
This commit makes sure that all declaration parameters must be surrounded with some kind of bracket. (e.g., '()', '{}', '[]').
The goal is to avoid counter-intuitive declarations such as:
example p : false := trivial
def main proof : false := trivial
which would be parsed as
example (p : false) : _ := trivial
def main (proof : false) : _ := trivial
where `_` in both cases is elaborated into `true`. This issue was raised by @gebner in the slack channel.
Remark: we still want implicit delimiters for lambda/pi expressions. That is, we want to write
fun x : t, s
or
fun x, s
instead of
fun (x : t), s
17 lines
336 B
Text
17 lines
336 B
Text
-- set_option trace.compiler true
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def fib_aux : ℕ → ℕ × ℕ
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| 0 := (0, 1)
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| (n+1) := let p := fib_aux n in (p.2, p.1 + p.2)
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def fib (n) := (fib_aux n).2
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#eval fib 10000
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def fib_aux2 : ℕ → ℕ × ℕ
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| 0 := (0, 1)
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| (n+1) := let (a, b) := fib_aux2 n in (b, a + b)
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def fib2 (n) := (fib_aux2 n).2
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#eval fib2 10000
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