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Consistently use a Witness rather than an expression to represent a possibly-symbolic witness. (#2245)

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Previously we used an expression in some places and a `Witness` values in others. The eventual goal is to make `Witness` values behave like other symbolic values such as `NominalClassType`, but the first step is to consistently treat them like values rather than expressions.

No functionality change intended.
This commit is contained in:
Richard Smith
2022-10-03 14:00:41 -07:00
committed by GitHub
parent c198dafbe8
commit 04d49cebd8
11 changed files with 222 additions and 152 deletions
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explorer/ast/expression.cpp
+3 -2
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@@ -258,8 +258,9 @@ void Expression::Print(llvm::raw_ostream& out) const {
break;
}
case ExpressionKind::InstantiateImpl: {
const auto& inst_impl = cast<InstantiateImpl>(*this);
out << "instantiate " << *inst_impl.generic_impl();
// TODO: For layering reasons, we can't print out the witness and
// argument values from here.
out << "instantiate impl";
break;
}
case ExpressionKind::UnimplementedExpression: {