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feat: expose diff at "synthesized type class instance is not definitionally equal" error #6213

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Nov 27, 2024
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feat: expose diff at "synthesized type class instance is not definitionally equal" error #6213

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2 changes: 2 additions & 0 deletions src/Lean/Elab/Term.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -1079,7 +1079,9 @@ def synthesizeInstMVarCore (instMVar : MVarId) (maxResultSize? : Option Nat := n
let oldValType ← inferType oldVal
let valType ← inferType val
unless (← isDefEq oldValType valType) do
let (oldValType, valType) ← addPPExplicitToExposeDiff oldValType valType
throwError "synthesized type class instance type is not definitionally equal to expected type, synthesized{indentExpr val}\nhas type{indentExpr valType}\nexpected{indentExpr oldValType}{extraErrorMsg}"
let (oldVal, val) ← addPPExplicitToExposeDiff oldVal val
throwError "synthesized type class instance is not definitionally equal to expression inferred by typing rules, synthesized{indentExpr val}\ninferred{indentExpr oldVal}{extraErrorMsg}"
else
unless (← isDefEq (mkMVar instMVar) val) do
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