Check anonymous functions with fresh results for consume conditions#26226
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odersky wants to merge 1 commit into
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Check anonymous functions with fresh results for consume conditions#26226odersky wants to merge 1 commit into
odersky wants to merge 1 commit into
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Previously, anonymous functions were excluded. lambda-fresh-2.scala shows why this is unsound. We now drop the special treatment of anonymous functions, and at the same time exclude LocalCaps that come from outside the function from checking.
bracevac
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Jun 3, 2026
| val f3: File^ = File() | ||
| val a: () => File^{fresh} = () => f1 // error | ||
| val b: () => File^ = () => f2 // ok | ||
| def g(): File^ = f3 // error |
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Why should this be an error?
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The scoped-capabilities.md might need to be revised as well.
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Why should this be an error?
Because File^ in a def means fresh. That was always an error but line 12 was not.
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This seems to be incorporated into #26193 and can be closed? |
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Yes, closing. |
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More problems with checking
freshcapabilities in results of anonymous functions...Previously, anonymous functions were excluded. lambda-fresh-2.scala shows why this is unsound. We now drop the special treatment of anonymous functions, and at the same time exclude LocalCaps that come from outside the function from checking.