Suppress "extension method will never be selected" for overrides#20164
Merged
smarter merged 2 commits intoscala:mainfrom Apr 11, 2024
Merged
Suppress "extension method will never be selected" for overrides#20164smarter merged 2 commits intoscala:mainfrom
smarter merged 2 commits intoscala:mainfrom
Conversation
In daeee35, support for tests in the directory `tests/pos-special/fatal-warnings` was dropped in favor of magic `//>` comments in the regular `tests/pos` directory, but a few tests were forgotten in the original directory and were thus not run. This commit moves them to the appropriate directory with the correct magic comment.
When we're overriding an existing extension method, we don't have the liberty of renaming the method, so we shouldn't get warnings we can't do anything about.
som-snytt
reviewed
Apr 11, 2024
| @@ -1,4 +1,4 @@ | |||
| //> using options -Wvalue-discard | |||
| //> using options -Xfatal-warnings -Wvalue-discard | |||
som-snytt
reviewed
Apr 11, 2024
| if !target.typeSymbol.denot.isAliasType && !target.typeSymbol.denot.isOpaqueAlias && hidden | ||
| then report.warning(ExtensionNullifiedByMember(sym, target.typeSymbol), sym.srcPos) | ||
| def checkExtensionMethods(sym: Symbol)(using Context): Unit = | ||
| if sym.is(Extension) && !sym.nextOverriddenSymbol.exists then |
Contributor
|
This is like the mitigation for "unused param" which says that if my method signature is constrained by an override, don't warn. Here, I must supply the given (for some purpose), and I'm not interested in this extension. I could signal that with a LHS that is But probably this case has an odor of niche. Overriders of extensions probably know what they're doing. From the Doors song, |
som-snytt
approved these changes
Apr 11, 2024
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When we're overriding an existing extension method, we don't have the liberty
of renaming the method, so we shouldn't get warnings we can't do anything
about.