zig

commit 1a0081b763d145de8a89ab94aca400daa5666dac (tree)
parent e0b635e825b72e1308dd0e2bbee578dafe62d9dc
Author: Andrew Kelley <superjoe30@gmail.com>
Date:   Sat, 22 Apr 2017 11:45:04 -0400

add peer type resolution for T and ?T

See #334

Diffstat:
M
src/ir.cpp
 | 
9
+++++++++
M
test/cases/cast.zig
 | 
14
++++++++++++--

2 files changed, 21 insertions(+), 2 deletions(-)
diff --git a/src/ir.cpp b/src/ir.cpp
@@ -6120,6 +6120,15 @@ static TypeTableEntry *ir_resolve_peer_types(IrAnalyze *ira, AstNode *source_nod
         {
             prev_inst = cur_inst;
             continue;
+        } else if (prev_type->id == TypeTableEntryIdMaybe &&
+                   types_match_const_cast_only(prev_type->data.maybe.child_type, cur_type))
+        {
+            continue;
+        } else if (cur_type->id == TypeTableEntryIdMaybe &&
+                   types_match_const_cast_only(cur_type->data.maybe.child_type, prev_type))
+        {
+            prev_inst = cur_inst;
+            continue;
         } else if (prev_type->id == TypeTableEntryIdNumLitInt ||
                     prev_type->id == TypeTableEntryIdNumLitFloat)
         {
diff --git a/test/cases/cast.zig b/test/cases/cast.zig
@@ -116,4 +116,15 @@ fn returnNullFromMaybeTypeErrorRef() -> %?&A {
 }
 fn returnNullLitFromMaybeTypeErrorRef() -> %?&A {
     return null;
-}
-\ No newline at end of file
+}
+
+test "peer type resolution: ?T and T" {
+    assert(??peerTypeTAndMaybeT(true, false) == 0);
+}
+fn peerTypeTAndMaybeT(c: bool, b: bool) -> ?usize {
+    if (c) {
+        return if (b) null else usize(0);
+    }
+
+    return usize(3);
+}