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.
350 lines
7.8 KiB
Text
350 lines
7.8 KiB
Text
import Lean.Elab.Command
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set_option guard_msgs.diff false
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#guard_msgs in
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/-- error: Unknown identifier `x` -/
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#guard_msgs in
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example : α := x
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/--
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error: Unknown identifier `x`
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---
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error: ❌️ Docstring on `#guard_msgs` does not match generated message:
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error: Unknown identifier `x`
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-/
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#guard_msgs in
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#guard_msgs in
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example : α := x
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#guard_msgs in
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in
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example : α := sorry
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#guard_msgs in
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs(warning) in
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example : α := sorry
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/-- warning: declaration uses 'sorry' -/
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#guard_msgs in
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#guard_msgs(error) in
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example : α := sorry
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#guard_msgs in
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#guard_msgs(drop warning) in
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example : α := sorry
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#guard_msgs in
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#guard_msgs(error, drop warning) in
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example : α := sorry
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#guard_msgs in
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/-- error: Unknown identifier `x` -/
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#guard_msgs(error, drop warning) in
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example : α := x
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#guard_msgs in
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/--
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error: failed to synthesize
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OfNat α 22
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numerals are polymorphic in Lean, but the numeral `22` cannot be used in a context where the expected type is
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α
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due to the absence of the instance above
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Hint: Additional diagnostic information may be available using the `set_option diagnostics true` command.
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-/
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#guard_msgs(error) in
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example : α := 22
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-- Trailing whitespace
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/--
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info: foo ⏎
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bar
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---
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error: ❌️ Docstring on `#guard_msgs` does not match generated message:
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info: foo ⏎
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bar
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-/
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#guard_msgs in
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#guard_msgs in
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run_meta Lean.logInfo "foo \nbar"
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#guard_msgs in
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/--
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info: foo ⏎
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bar
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-/
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#guard_msgs in
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run_meta Lean.logInfo "foo \nbar"
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/--
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info: foo ⏎⏎
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bar
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---
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error: ❌️ Docstring on `#guard_msgs` does not match generated message:
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info: foo ⏎⏎
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bar
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-/
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#guard_msgs in
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#guard_msgs in
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run_meta Lean.logInfo "foo ⏎\nbar"
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#guard_msgs in
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/--
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info: foo ⏎⏎
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bar
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-/
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#guard_msgs in
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run_meta Lean.logInfo "foo ⏎\nbar"
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/-!
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Lax whitespace
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-/
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/--
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error: failed to synthesize
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DecidableEq (Nat → Nat)
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Hint: Additional diagnostic information may be available using the `set_option diagnostics true` command.
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-/
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#guard_msgs (whitespace := lax) in
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#synth DecidableEq (Nat → Nat)
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/--
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error: failed to synthesize
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DecidableEq (Nat → Nat)
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Hint: Additional diagnostic information may be available using the `set_option diagnostics true` command.
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-/
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#guard_msgs (whitespace := lax) in
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#synth DecidableEq (Nat → Nat)
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/-!
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Sorting
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-/
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/--
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info: A
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---
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info: B
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-/
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#guard_msgs (ordering := sorted) in
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run_meta do Lean.logInfo "B"; Lean.logInfo "A"
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/--
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info: B
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---
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info: A
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-/
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#guard_msgs in
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run_meta do Lean.logInfo "B"; Lean.logInfo "A"
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/-!
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Linter suppression. `#guard_msgs` is special-cased by the command elaborator so that linters aren't
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run on `#guard_msgs` itself, just on its command.
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-/
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set_option linter.unusedVariables true
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#guard_msgs in
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/--
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warning: unused variable `n`
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Note: This linter can be disabled with `set_option linter.unusedVariables false`
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-/
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#guard_msgs in
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example (n : Nat) : True := trivial
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#guard_msgs in
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/--
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warning: unused variable `n`
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Note: This linter can be disabled with `set_option linter.unusedVariables false`
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-/
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#guard_msgs in
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#guard_msgs (info) in
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example (n : Nat) : True := trivial
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/-!
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Test diffs
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-/
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/--
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info: ABCDEFG
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HIJKLMNOP
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QRSTUVWXYZ
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---
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error: ❌️ Docstring on `#guard_msgs` does not match generated message:
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-
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+ info: ABCDEFG
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+ HIJKLMNOP
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+ QRSTUVWXYZ
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-/
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#guard_msgs in
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set_option guard_msgs.diff true in
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#guard_msgs in
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#eval IO.println "ABCDEFG\nHIJKLMNOP\nQRSTUVWXYZ"
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/--
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info: ABCDEFG
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HIJKLMNOP
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QRSTUVWXYZ
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---
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error: ❌️ Docstring on `#guard_msgs` does not match generated message:
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info: ABCDEFG
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+ HIJKLMNOP
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QRSTUVWXYZ
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-/
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#guard_msgs in
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set_option guard_msgs.diff true in
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/--
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info: ABCDEFG
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QRSTUVWXYZ
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-/
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#guard_msgs in
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#eval IO.println "ABCDEFG\nHIJKLMNOP\nQRSTUVWXYZ"
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inductive Tree where
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| leaf (x : Nat)
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| branch (left : Tree) (x : Nat) (right : Tree)
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deriving Repr
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def Tree.build (n k : Nat) : Tree :=
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if n = 0 then leaf k else branch (Tree.build (n - 1) k) n (Tree.build (n - k - 1) (k / 2))
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/--
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info: Tree.branch
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(Tree.branch
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(Tree.branch
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(Tree.branch
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(Tree.branch
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(Tree.branch (Tree.branch (Tree.branch (Tree.leaf 3) 1 (Tree.leaf 1)) 2 (Tree.leaf 1)) 3 (Tree.leaf 1))
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4
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(Tree.leaf 1))
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5
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(Tree.branch (Tree.leaf 1) 1 (Tree.leaf 0)))
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6
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(Tree.branch (Tree.branch (Tree.leaf 1) 1 (Tree.leaf 0)) 2 (Tree.leaf 0)))
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7
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(Tree.branch
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(Tree.branch (Tree.branch (Tree.leaf 1) 1 (Tree.leaf 0)) 2 (Tree.leaf 0))
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3
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(Tree.branch (Tree.leaf 0) 1 (Tree.leaf 0))))
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8
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(Tree.branch
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(Tree.branch
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(Tree.branch (Tree.branch (Tree.leaf 1) 1 (Tree.leaf 0)) 2 (Tree.leaf 0))
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3
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(Tree.branch (Tree.leaf 0) 1 (Tree.leaf 0)))
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4
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(Tree.branch (Tree.branch (Tree.leaf 0) 1 (Tree.leaf 0)) 2 (Tree.branch (Tree.leaf 0) 1 (Tree.leaf 0))))
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---
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error: ❌️ Docstring on `#guard_msgs` does not match generated message:
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info: Tree.branch
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(Tree.branch
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(Tree.branch
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(Tree.branch
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(Tree.branch
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- (Tree.branch (Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.leaf)) 3 (Tree.leaf))
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+ (Tree.branch (Tree.branch (Tree.branch (Tree.leaf 3) 1 (Tree.leaf 1)) 2 (Tree.leaf 1)) 3 (Tree.leaf 1))
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4
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- (Tree.leaf))
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+ (Tree.leaf 1))
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5
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- (Tree.branch (Tree.leaf) 1 (Tree.leaf)))
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+ (Tree.branch (Tree.leaf 1) 1 (Tree.leaf 0)))
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6
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- (Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.leaf)))
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+ (Tree.branch (Tree.branch (Tree.leaf 1) 1 (Tree.leaf 0)) 2 (Tree.leaf 0)))
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7
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(Tree.branch
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- (Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.leaf))
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+ (Tree.branch (Tree.branch (Tree.leaf 1) 1 (Tree.leaf 0)) 2 (Tree.leaf 0))
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3
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- (Tree.branch (Tree.leaf) 1 (Tree.leaf))))
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+ (Tree.branch (Tree.leaf 0) 1 (Tree.leaf 0))))
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8
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(Tree.branch
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(Tree.branch
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- (Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.leaf))
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+ (Tree.branch (Tree.branch (Tree.leaf 1) 1 (Tree.leaf 0)) 2 (Tree.leaf 0))
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3
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- (Tree.branch (Tree.leaf) 1 (Tree.leaf)))
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+ (Tree.branch (Tree.leaf 0) 1 (Tree.leaf 0)))
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4
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- (Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.branch (Tree.leaf) 1 (Tree.leaf))))
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+ (Tree.branch (Tree.branch (Tree.leaf 0) 1 (Tree.leaf 0)) 2 (Tree.branch (Tree.leaf 0) 1 (Tree.leaf 0))))
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-/
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#guard_msgs in
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set_option guard_msgs.diff true in
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/--
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info: Tree.branch
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(Tree.branch
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(Tree.branch
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(Tree.branch
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(Tree.branch
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(Tree.branch (Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.leaf)) 3 (Tree.leaf))
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4
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(Tree.leaf))
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5
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(Tree.branch (Tree.leaf) 1 (Tree.leaf)))
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6
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(Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.leaf)))
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7
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(Tree.branch
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(Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.leaf))
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3
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(Tree.branch (Tree.leaf) 1 (Tree.leaf))))
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8
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(Tree.branch
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(Tree.branch
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(Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.leaf))
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3
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(Tree.branch (Tree.leaf) 1 (Tree.leaf)))
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4
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(Tree.branch (Tree.branch (Tree.leaf) 1 (Tree.leaf)) 2 (Tree.branch (Tree.leaf) 1 (Tree.leaf))))
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-/
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#guard_msgs in
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#eval Tree.build 8 3
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section Trace
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/-! check that guard_msgs by defaults passes trace messages -/
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set_option trace.debug true
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/-- trace: [debug] a trace -/
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#guard_msgs(all) in
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#guard_msgs(info) in
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run_meta trace[debug] "a trace"
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#guard_msgs(all) in
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/-- trace: [debug] a trace -/
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#guard_msgs(trace) in
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run_meta trace[debug] "a trace"
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#guard_msgs(all) in
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#guard_msgs(drop trace) in
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run_meta trace[debug] "a trace"
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#guard_msgs(all) in
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/-- trace: [debug] a trace -/
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#guard_msgs in
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run_meta trace[debug] "a trace"
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#guard_msgs(all) in
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/-- trace: [debug] a trace -/
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#guard_msgs in
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run_meta trace[debug] "a trace"
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end Trace
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