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Introduce then statements

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These allow multi-statement `if`/`switch` expression
branches that can produce a value at the end by
saying `then <expr>`. This is gated behind
`-enable-experimental-feature ThenStatements`
pending evolution discussion.
This commit is contained in:
Hamish Knight
2023-09-01 14:32:14 +01:00
parent 99a36b3f00
commit 6ee44f09b4
47 changed files with 1063 additions and 196 deletions
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4
lib/Sema/CSGen.cpp
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@@ -3872,10 +3872,10 @@ namespace {
if (auto *SVE = expr->getSingleValueStmtExpr()) {
// If we have a SingleValueStmtExpr, form a join of the branch types.
SmallVector<Expr *, 4> scratch;
auto branches = SVE->getSingleExprBranches(scratch);
auto branches = SVE->getResultExprs(scratch);
for (auto idx : indices(branches)) {
auto *eltLoc = CS.getConstraintLocator(
SVE, {LocatorPathElt::SingleValueStmtBranch(idx)});
SVE, {LocatorPathElt::SingleValueStmtResult(idx)});
elements.emplace_back(CS.getType(branches[idx]), eltLoc);
}
} else {