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chore: break up universe level error message (#9637)

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This PR improves the readability of the "maximum universe level offset
exceeded" error message.
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jrr6 2025-07-30 19:52:53 -04:00 • committed by GitHub
parent b8e801ecad
commit 3a3c816a27
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2 changed files with 9 additions and 3 deletions
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4
src/Lean/Elab/Level.lean
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@ -56,7 +56,9 @@ register_builtin_option maxUniverseOffset : Nat := {
private def checkUniverseOffset [Monad m] [MonadError m] [MonadOptions m] (n : Nat) : m Unit := do
let max := maxUniverseOffset.get (← getOptions)
unless n <= max do
throwError "maximum universe level offset threshold ({max}) has been reached, you can increase the limit using option `set_option maxUniverseOffset <limit>`, but you are probably misusing universe levels since offsets are usually small natural numbers"
throwError m!"Universe level offset `{n}` exceeds maximum offset `{max}`"
++ .note m!"This code is probably misusing universe levels, since they are usually small natural numbers. \
If you are confident this is not the case, you can increase the limit using `set_option maxUniverseOffset <limit>`"
partial def elabLevel (stx : Syntax) : LevelElabM Level := withRef stx do
let kind := stx.getKind

8
tests/lean/bigUnivOffsets.lean.expected.out
View file

@ -1,2 +1,6 @@
bigUnivOffsets.lean:1:12-1:21: error: maximum universe level offset threshold (32) has been reached, you can increase the limit using option `set_option maxUniverseOffset <limit>`, but you are probably misusing universe levels since offsets are usually small natural numbers
bigUnivOffsets.lean:5:13-5:25: error: maximum universe level offset threshold (32) has been reached, you can increase the limit using option `set_option maxUniverseOffset <limit>`, but you are probably misusing universe levels since offsets are usually small natural numbers
bigUnivOffsets.lean:1:12-1:21: error: Universe level offset `100000000` exceeds maximum offset `32`
Note: This code is probably misusing universe levels, since they are usually small natural numbers. If you are confident this is not the case, you can increase the limit using `set_option maxUniverseOffset <limit>`
bigUnivOffsets.lean:5:13-5:25: error: Universe level offset `10000000` exceeds maximum offset `32`
Note: This code is probably misusing universe levels, since they are usually small natural numbers. If you are confident this is not the case, you can increase the limit using `set_option maxUniverseOffset <limit>`