Use tree checker in macros #16570
Use tree checker in macros #16570
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nicolasstucki
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We should test this on the extended community build before merging. |
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Extended community test: https://scala3.westeurope.cloudapp.azure.com/job/runBuild/125/ |
| if ctx.settings.XcheckMacros.value then | ||
| val checkingCtx = ctx | ||
| .fresh | ||
| .addMode(Mode.ImplicitsEnabled) |
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Do we really need to generate implicits when checking trees?
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I followed the original tree checker https://github.com/lampepfl/dotty/blob/main/compiler/src/dotty/tools/dotc/transform/TreeChecker.scala#L137.
I will try removing both.
| val implicitTree = ctx.typer.inferImplicitArg(tpe, Position.ofMacroExpansion.span) | ||
| // Make sure that we do not have any uninstantiated type variables. | ||
| // See tests/pos-macros/exprSummonWithTypeVar with -Xcheck-macros. | ||
| implicitTree.foreachSubTree(tree => dotc.typer.Inferencing.fullyDefinedType(tree.tpe, "", tree)) |
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foreachSubTree is expensive. You could use typer.interpolateTypeVars instead (probably with pt = WildcardType and locked = ctx.typerState.ownedVars).
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interpolateTypeVars did not work.
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I there a way to make inferImplicitArg resolve all type variables that it inserts?
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Try defining val locked = ctx.typerState.ownedVars before the call to inferImplicitArg, so that variables created by it can be instantiated when you pass locked to interpolateTypeVars
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It did not work either. Note that the ownedVars of this context are empty before and after the call to inferImplicitArg. The type variable in introduced within inferImplicitArg.
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The issue was that an uninstantiated type variable escaped the implicit search and was then affected by the quote pattern match. Fixes scala#15779 Fixes scala#16636
Trees are only checked if -Xcheck-macros is enabled.
Fixes:
- Add missing positions to {ValDef,Bind}.apply
- Inline by-name ascribed param
- Buggy test (tests/neg-macros/annot-mod-top-method-add-top-method)
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| val methType = MethodType(Nil)(_ => Nil, _ => TypeRepr.of[Int]) | ||
| val methSym = Symbol.newMethod(Symbol.spliceOwner.owner, Symbol.freshName("toLevelMethod"), methType, Flags.EmptyFlags, Symbol.noSymbol) | ||
| val methDef = ValDef(methSym, Some(Literal(IntConstant(1)))) | ||
| val methDef = DefDef(methSym, _ => Some(Literal(IntConstant(1)))) |
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After rebasing, the check caught this unintended bug in this neg test.
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Trees are only checked if
-Xcheck-macrosis enabled.Fixes:
{ValDef,Bind}.applyobjectafter a seemingly innocent quote match #16636