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Allow void on the RHS of null coalescing expressions

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Change-Id: I2e2d16c890c735260669d60725085861e66996aa
Reviewed-on: https://dart-review.googlesource.com/67081
Reviewed-by: Erik Ernst <eernst@google.com>
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Leaf Petersen 2018-07-30 17:44:40 +00:00
parent 17cb6d95d1
commit 73663ae7c6
1 changed files with 2 additions and 0 deletions
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docs/language/informal/generalized-void.md
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@ -274,6 +274,8 @@ for the following situations:
type void; the static type of the conditional expression is then the
type void. (*This is true even if one of the branches has a different
type.*)
* In a null coalescing expression `e1 ?? e2`, `e2` may have the type void; the
static type of the null coalescing expression is then the type void.
* If _N1_ and _N2_ are non-terminals in the Dart grammar, and there is a
derivation of the form _N1 --> N2_, and _N2_ can have type void, then
_N1_ can also have type void for such a derivation. *In this derivation