fc076c5acc
This PR fixes a bug where the `DecidableEq` deriving handler did not take universe levels into account for enumerations (inductive types whose constructors all have no fields). Closes #9541.
45 lines
793 B
Text
45 lines
793 B
Text
/-!
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# DecidableEq deriving handler for enumerations in higher universes
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https://github.com/leanprover/lean4/issues/9541
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-/
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/-!
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Basic case, this always worked.
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-/
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inductive I0 : Type
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| A | B | C
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deriving DecidableEq
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/-!
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Example from the issue.
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-/
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inductive I1 : Type 1
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| A | B | C
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deriving DecidableEq
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/-!
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Parameterized works.
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-/
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inductive I2.{u} : Type u
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| A | B | C
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deriving DecidableEq
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/-!
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Parameterized with two variables works.
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-/
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inductive I3.{u, v} : Type (max u v)
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| A | B | C
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deriving DecidableEq
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/-!
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Parameterized with `Sort (max 1 _)` works.
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-/
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inductive I4.{u} : Sort (max 1 u)
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| A | B | C
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deriving DecidableEq
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/-- info: instDecidableEqI4 -/
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#guard_msgs in #synth DecidableEq I4.{0}
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/-- info: instDecidableEqI4 -/
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#guard_msgs in #synth DecidableEq I4.{1}
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