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.
62 lines
1.4 KiB
Text
62 lines
1.4 KiB
Text
/-!
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Assortion of tests to make sure the #8815 simp arg elaboration refactoring did not change
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behavior.
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-/
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set_option linter.unusedVariables false
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example (P Q : Prop) (hQ : Q) (hP : P) : P := by simp [*, -hQ]
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/-- error: simp made no progress -/
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#guard_msgs in example (P Q : Prop) (hQ : Q) (hP : P) : P := by simp [*, -hP]
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/-- error: Unknown constant `hQ` -/
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#guard_msgs in example (P Q : Prop) (hQ : Q) (hP : P) : P := by simp [-hQ, *]
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#guard_msgs in example (P Q : Prop) (hQ : Q) (hP : P) : P := by simp_all [-hQ]
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/--
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error: Unknown constant `hQ`
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---
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error: simp made no progress
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-/
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#guard_msgs in example (P Q : Prop) (hQ : Q) (hP : P) : P := by simp [-hQ]
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theorem a_thm : True := trivial
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def f : Nat → Nat
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| 0 => 1
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| n + 1 => f n + 1
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example : f 0 > 0 := by simp [f]
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example : f 0 > 0 := by simp!
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-- NB: simp! disables all warnings, not just for declarations to unfold
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-- Mild bug, but not a regresion.
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/--
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error: unsolved goals
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⊢ 0 < f 0
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-/
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#guard_msgs in example : f 0 > 0 := by simp! [-f, -a_thm]
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/--
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warning: 'f' does not have [simp] attribute
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---
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warning: 'a_thm' does not have [simp] attribute
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---
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error: unsolved goals
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⊢ 0 < f 0
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-/
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#guard_msgs in example : f 0 > 0 := by
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simp [-f, -a_thm]
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/--
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error: invalid 'simp', proposition expected
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Type 32
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-/
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#guard_msgs in
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example : True := by simp [Sort 32] -- mostly about error location, once guard_msgs shows that
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