05e5d934d3
Now, the following example produces a syntax error. ```lean macro "foo!" x:term : term => `($x + 1) check id foo! 10 ``` @Kha, I think the heuristic is simple and defensible. If the new syntax starts and ends with token, than the precedence is `maxPrec`. Otherwise, it is `leadPrec`. see #180
41 lines
703 B
Text
41 lines
703 B
Text
new_frontend
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#check id fun x => x -- should work
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#check 0
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def f (x : Nat) (g : Nat → Nat) := g x
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#check f 1 fun x => x -- should fail
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#check 0
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#check f 1 (fun x => x)
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#check id have True from ⟨⟩; this -- should fail
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#check id let x := 10; x
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#check 1
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#check id (have True from ⟨⟩; this)
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#check 0 = have Nat from 1; this
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#check 0 = let x := 0; x
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variables (p q r : Prop)
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macro_rules `(¬ $p) => `(Not $p)
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#check p ↔ ¬ q
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#check True = ¬ False
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#check p ∧ ¬q
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#check ¬p ∧ q
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#check ¬p ↔ q
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#check ¬(p = q)
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#check ¬ p = q
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#check id ¬p
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#check Nat → ∀ (a : Nat), a = a
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macro "foo!" x:term : term => `($x + 1)
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#check id foo! 10 -- error, `foo! x` precedence is leadPrec
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