5f4e6a86d5
This PR updates the formatting of, and adds explanations for, "unknown identifier" errors as well as "failed to infer type" errors for binders and definitions. It attempts to ameliorate some of the confusion encountered in #1592 by modifying the wording of the "header is elaborated before body is processed" note and adding further discussion and examples of this behavior in the corresponding error explanation.
99 lines
2.2 KiB
Text
99 lines
2.2 KiB
Text
def replace (f : Nat → Option Nat) (t : Nat) : Nat :=
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match f t with
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| some u => u
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| none =>
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match t with
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| .zero => .zero
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| .succ t' => replace f t'
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/--
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info: equations:
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@[defeq] theorem replace.eq_1 : ∀ (f : Nat → Option Nat),
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replace f Nat.zero =
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match f Nat.zero with
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| some u => u
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| none => Nat.zero
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@[defeq] theorem replace.eq_2 : ∀ (f : Nat → Option Nat) (t' : Nat),
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replace f t'.succ =
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match f t'.succ with
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| some u => u
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| none => replace f t'
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-/
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#guard_msgs in
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#print equations replace
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/--
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error: Failed to realize constant replace.eq_def:
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failed to generate unfold theorem for 'replace'
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case h_1
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f : Nat → Option Nat
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t : Nat
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x : Option Nat
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u : Nat
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heq✝ : f t = some u
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⊢ replace f t = u
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---
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error: Failed to realize constant replace.eq_def:
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failed to generate unfold theorem for 'replace'
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case h_1
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f : Nat → Option Nat
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t : Nat
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x : Option Nat
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u : Nat
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heq✝ : f t = some u
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⊢ replace f t = u
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---
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error: Unknown identifier `replace.eq_def`
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-/
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#guard_msgs in
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#check replace.eq_def
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def replace2 (f : Nat → Option Nat) (t1 t2 : Nat) : Nat :=
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match f t1 with
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| some u => u
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| none =>
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match t2 with
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| .zero => .zero
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| .succ t' => replace2 f t1 t'
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/--
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info: equations:
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@[defeq] theorem replace2.eq_1 : ∀ (f : Nat → Option Nat) (t1 : Nat),
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replace2 f t1 Nat.zero =
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match f t1 with
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| some u => u
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| none => Nat.zero
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@[defeq] theorem replace2.eq_2 : ∀ (f : Nat → Option Nat) (t1 t' : Nat),
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replace2 f t1 t'.succ =
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match f t1 with
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| some u => u
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| none => replace2 f t1 t'
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-/
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#guard_msgs in
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#print equations replace2
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/--
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error: Failed to realize constant replace2.eq_def:
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failed to generate unfold theorem for 'replace2'
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case h_1
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f : Nat → Option Nat
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t1 t2 : Nat
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x : Option Nat
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u : Nat
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heq✝ : f t1 = some u
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⊢ replace2 f t1 t2 = u
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---
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error: Failed to realize constant replace2.eq_def:
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failed to generate unfold theorem for 'replace2'
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case h_1
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f : Nat → Option Nat
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t1 t2 : Nat
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x : Option Nat
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u : Nat
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heq✝ : f t1 = some u
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⊢ replace2 f t1 t2 = u
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---
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error: Unknown identifier `replace2.eq_def`
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-/
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#guard_msgs in
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#check replace2.eq_def
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