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R=go1.11 Functions (at the package level) were collected and their bodies type-checked after all other package-level objects were checked. But function literals where type-checked right away when they were encountered so that they could see the correct, partially populated surrounding scope, and also to mark variables of the surrounding function as used. This approach, while simple, breaks down in esoteric cases where a function literal appears inside the declaration of an object that its body depends on: If the body is type-checked before the object is completely set up, the literal may use incomplete data structures, possibly leading to spurious errors. This change postpones type-checking of function literals to later; after the current expression or statement, but before any changes to the enclosing scope (so that the delayed type-checking sees the correct scope contents). The new mechanism is general and now is also used for other (non-function) delayed checks. Fixes #22992. Change-Id: Ic95f709560858b4bdf8c645be70abe4449f6184d Reviewed-on: https://go-review.googlesource.com/83397 Reviewed-by: Alan Donovan <adonovan@google.com> |
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The Go Programming Language
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