0e122870be
This PR changes `mkNoConfusionCtors` so that its use of `inferType` does not have to reduce `noConfusionType`, to make #10315 really effective.
42 lines
1.2 KiB
Text
42 lines
1.2 KiB
Text
import Lean
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/-!
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Creates an non-recursive inductive data type with n constructors and deriving `BEq`.
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-/
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set_option Elab.async false
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open Lean Elab
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open Elab.Command (CommandElab CommandElabM elabCommand)
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open Parser.Command
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open Parser.Term
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-- Create a name.
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def strName (s : String) : Name := Name.anonymous |>.str s
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def mkCtorStr (idx : Nat) : String := s!"con{idx}"
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def mkCtorIdent (idx : Nat) : Ident := mkIdent <| strName <| mkCtorStr idx
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/--
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`#test_gen name cnt` creates an inductive type with icnt` unary constructors
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-/
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syntax (name := testGen) (docComment)? "#test_gen" ident num : command -- declare the syntax
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@[command_elab testGen]
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def testGenImpl: CommandElab := fun stx => do
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match stx with
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| `(#test_gen $t $con_count) =>
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let con_count := con_count.getNat
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let cons ← Array.ofFnM (n := con_count) fun cIdx =>
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let con := mkCtorIdent cIdx
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`(ctor| | $con:ident : α → $t:ident α )
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let idecl ←
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-- Create constant case definitions
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`(inductive $t:ident (α : Type) : Type where
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$cons:ctor*
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deriving instance BEq for $t:ident
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)
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elabCommand idecl
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| _ =>
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throwIllFormedSyntax
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#time #test_gen T 100
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