Do not emit type errors on recovered blocks

When a parse error occurs on a block, the parser will recover and create
a block with the statements collected until that point. Now a flag
stating that a recovery has been performed in this block is propagated
so that the type checker knows that the type of the block (which will be
identified as `()`) shouldn't be checked against the expectation to
reduce the amount of irrelevant diagnostic errors shown to the user.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
index 9a96432f11d..8aeebecf661 100644
--- a/src/libsyntax/ext/build.rs
+++ b/src/libsyntax/ext/build.rs
@@ -594,6 +594,7 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
            id: ast::DUMMY_NODE_ID,
            rules: BlockCheckMode::Default,
            span,
+           recovered: false,
         })
     }