Implement experimental module selectors (MyMod::someName) feature #34556
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Woohoo! Thank you for reviving this, Becca! |
Try to avoid calling `getSourceRange()` on a decl where that will form an invalid range.
When closing paren is missing, point at the location where it should be found, not the opening paren.
A PatternBindingEntry formed from a MissingPatternSyntax has no valid SourceLocs in it, and a PatternBindingDecl containing only PatternBindingEntries with no valid SourceLocs trips an assertion during availability checking. (Generating dummy SourceLocs can cause invalid overlaps between AvailabilityScopes, so that’s not a workable solution.) The fix is to: • Refuse to generate a PatternBindingEntry from a PatternBindingSyntax with a MissingPatternSyntax (MissingPatternSyntaxes at nested positions don’t have this problem) • Refuse to generate a PatternBindingDecl with no PatternBindingEntries This ensures that the invalid AST nodes are never formed. No current test cases hit this problem, but certain invalid module selector tests can run into this situation when run with ASTGen.
The diagnostics in this test will evolve as we implement pieces of the feature.
Adds comments explaining why these conversions aren’t lossy.
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With swiftlang/swift-syntax#3091 @swift-ci please smoke test |
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This pull request begins to implement "module selectors", which allow references to declarations to be unambiguously prefixed with a module they can be found through:
This PR parses module selectors and partially implements lookup and diagnostics for them. The new functionality is hidden behind an
-enable-experimental-module-selectorfrontend flag. There is one diagnostic regression with that flag enabled, but I've made sure that it keeps working when the diagnostic is disabled.This work was previously in PR #28834, which was closed during the master-to-main transition. I've updated it to work on modern compilers, including removing some FIXMEs for bad diagnostics that have improved since December 2019.
Makes progress on rdar://problem/19481048.