diff options
| -rw-r--r-- | src/comp/middle/trans.rs | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/src/comp/middle/trans.rs b/src/comp/middle/trans.rs index ac3d78e7..f69834d3 100644 --- a/src/comp/middle/trans.rs +++ b/src/comp/middle/trans.rs @@ -4050,7 +4050,27 @@ fn trans_vec(@block_ctxt cx, vec[@ast.expr] args, bcx = src_res.bcx; auto dst_res = GEP_tup_like(bcx, pseudo_tup_ty, body, vec(0, i)); bcx = dst_res.bcx; - bcx = copy_ty(bcx, INIT, dst_res.val, src_res.val, unit_ty).bcx; + + // Cast the destination type to the source type. This is needed to + // make tags work, for a subtle combination of reasons: + // + // (1) "dst_res" above is derived from "body", which is in turn + // derived from "vec_val". + // (2) "vec_val" has the LLVM type "llty". + // (3) "llty" is the result of calling type_of() on a vector type. + // (4) For tags, type_of() returns a different type depending on + // on whether the tag is behind a box or not. Vector types are + // considered boxes. + // (5) "src_res" is derived from "unit_ty", which is not behind a box. + + auto dst_val; + if (!ty.type_has_dynamic_size(unit_ty)) { + dst_val = bcx.build.PointerCast(dst_res.val, T_ptr(llunit_ty)); + } else { + dst_val = dst_res.val; + } + + bcx = copy_ty(bcx, INIT, dst_val, src_res.val, unit_ty).bcx; i += 1; } auto fill = bcx.build.GEP(vec_val, |