bc23383194
even when rewriting the type of `h` becuase there is no expected type. (When there is an expected type, it already tried both orientations.) Also feeble attempt to include this information in the docstring without writing half a manual chapter.
18 lines
1 KiB
Text
18 lines
1 KiB
Text
def foo := 3
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def bar := 4
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def ex1 (heq : foo = bar) (P : Nat → Prop) (h : P foo) := heq ▸ h
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#check ex1
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def ex2 (heq : foo = bar) (P : Nat → Prop) (h : P foo) : P 4 := heq ▸ h -- error
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def ex3 (heq : foo = bar) (P : Nat → Prop) (h : P foo) : P bar := heq ▸ h
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def ex4 (heq : foo = bar) (P : Nat → Prop) (h : P 3) := heq ▸ h -- error
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def ex5 (heq : foo = bar) (P : Nat → Prop) (h : P 3) : P 4 := heq ▸ h -- error
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def ex6 (heq : foo = bar) (P : Nat → Prop) (h : P 3) : P bar := heq ▸ h
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def ex7 (heq : bar = foo) (P : Nat → Prop) (h : P foo) := heq ▸ h
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#check ex7
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def ex8 (heq : bar = foo) (P : Nat → Prop) (h : P foo) : P 4 := heq ▸ h -- error
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def ex9 (heq : bar = foo) (P : Nat → Prop) (h : P foo) : P bar := heq ▸ h
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def ex10 (heq : bar = foo) (P : Nat → Prop) (h : P 3) := heq ▸ h -- error
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def ex11 (heq : bar = foo) (P : Nat → Prop) (h : P 3) : P 4 := heq ▸ h -- error
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def ex12 (heq : bar = foo) (P : Nat → Prop) (h : P 3) : P bar := heq ▸ h
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