18 lines
542 B
Text
18 lines
542 B
Text
defInst.lean:6:0-6:12: error: expression
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test 4
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has type
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Foo
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but instance
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Lean.Eval Foo
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failed to be synthesized, this instance instructs Lean on how to display the resulting value, recall that any type implementing the `Repr` class also implements the `Lean.Eval` class
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defInst.lean:8:26-8:32: error: failed to synthesize instance
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BEq Foo
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fun x y => sorryAx (?m x y) : (x y : Foo) → ?m x y
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[4, 5, 6]
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fun x y => x == y : Foo → Foo → Bool
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[("hello", "hello")]
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false
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true
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true
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def instMMonad : Monad M :=
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ReaderT.instMonadReaderT
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