Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
9f49ea63e2
This PR adds a new option `backward.isDefEq.respectTransparency.types` that controls the transparency used when checking whether the type of a metavariable matches the type of the term being assigned to it during `checkTypesAndAssign`. Previously, this check always bumped transparency to `.default` (via `withInferTypeConfig`), which is overly permissive. The new option uses `.instances` transparency instead (via `withImplicitConfig`), matching the behavior already used for implicit arguments. The option defaults to `false` (preserving old behavior) until stage0 is updated and breakage is assessed. If `backward.isDefEq.respectTransparency` (already in v4.29) is set to `false`, then `backward.isDefEq.respectTransparency.types` is automatically treated as `false` too. When `diagnostics` is enabled, a trace message is emitted if the stricter transparency fails but `.default` would have succeeded, helping identify affected code. To investigate failures when enabling `backward.isDefEq.respectTransparency.types`, use: ``` set_option diagnostics true set_option trace.diagnostics true ``` Also renames `withInstanceConfig` to `withImplicitConfig` since it now serves implicit argument and type checking, not just instances. Registers the `diagnostics` trace class in `CoreM`. Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com> |
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