[ConstraintSystem] Remove implementation of operator designated types in the solver. #34315
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xedin
reviewed
Oct 15, 2020
| // us to eliminate behavior that is exponential in the number of | ||
| // operators in the expression. | ||
| if (getASTContext().TypeCheckerOpts.SolverEnableOperatorDesignatedTypes) { | ||
| if (auto *disjunction = selectApplyDisjunction()) |
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I think selectApplyDisjunction could also be removed now right?
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Ah you're right, thanks for catching that!
xedin
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Oct 15, 2020
by the operator designated types implementation.
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beccadax
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Designated types were removed from the constraint solver in swiftlang#34315, but they are currently still represented in the AST and fully checked. This change removes them as completely as possible without breaking source compatibility (mainly with old swiftinterfaces) or changing the SwiftSyntax tree. Designated types are still parsed, but they are dropped immediately and a warning is diagnosed. During decl checking we also still check if the precedence group is really a designated type, but only so that we can diagnose a warning and fall back to DefaultPrecedence. This change also fixes an apparent bug in the parser where we did not diagnose operator declarations that contained a `:` followed by a non-identifier token.
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Remove the
-solver-enable-operator-designated-typesflag and implementation in the solver. This experimental feature is no longer being explored, and we're implementing other approaches to improving constraint solver performance that break this feature.There's a little more to remove (the
-enable-operator-designated-typesflag enables designated types in the parser, and designated type syntax is adopted in the standard library) but this lets me make more progress on chipping away at solver performance hacks.