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Untangle subtyping rules explanation in type-lambdas-spec.md #22319

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Untangle subtyping rules explanation in type-lambdas-spec.md #22319

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Untangle subtyping rules explanation in type-lambdas-spec.md
ozenzin Jan 8, 2025
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Merge branch 'scala:main' into patch-1
ozenzin Jan 16, 2025
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8 changes: 4 additions & 4 deletions docs/_docs/reference/new-types/type-lambdas-spec.md
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Expand Up @@ -26,11 +26,11 @@ Assume two type lambdas
type TL1 = [X >: L1 <: U1] =>> R1
type TL2 = [X >: L2 <: U2] =>> R2
```
Then `TL1 <: TL2`, if
Then `TL2 <: TL1`, if

- the type interval `L2..U2` is contained in the type interval `L1..U1` (i.e.
`L1 <: L2` and `U2 <: U1`),
- `R1 <: R2`
- the type interval `L1..U1` is contained in the type interval `L2..U2` (i.e.
`L2 <: L1` and `U1 <: U2`),
- `R2 <: R1`

Here we have relied on [alpha renaming](https://en.wikipedia.org/wiki/Lambda_calculus#%CE%B1-conversion) to match the two bound types `X`.

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