From e7c6715ec82458cf0b9a362bf9b068d0574607f9 Mon Sep 17 00:00:00 2001
From: Iain Buclaw <ibuclaw@gcc.gnu.org>
Date: Sun, 16 Jun 2019 07:48:23 +0000
Subject: [PATCH] re PR d/90602 (ICE: null field)

	PR d/90602
d/dmd: Merge upstream dmd 420cce2a6

Fixes internal compiler error during CTFE.

Reviewed-on: https://github.com/dlang/dmd/pull/9997

From-SVN: r272342
---
 gcc/d/dmd/MERGE                                     |  2 +-
 gcc/d/dmd/dinterpret.c                              | 13 ++++++++++---
 gcc/testsuite/gdc.test/fail_compilation/fail19897.d | 13 +++++++++++++
 3 files changed, 24 insertions(+), 4 deletions(-)
 create mode 100644 gcc/testsuite/gdc.test/fail_compilation/fail19897.d

diff --git a/gcc/d/dmd/MERGE b/gcc/d/dmd/MERGE
index 6edc63a2014..7456d604a91 100644
--- a/gcc/d/dmd/MERGE
+++ b/gcc/d/dmd/MERGE
@@ -1,4 +1,4 @@
-c74e624c9a0a9e7e39f96b2f005f86e123df56c9
+420cce2a654f14b8de4a75cbb5d4203fce8d4e0f
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/dmd repository.
diff --git a/gcc/d/dmd/dinterpret.c b/gcc/d/dmd/dinterpret.c
index acca4e8097d..0749c7f487d 100644
--- a/gcc/d/dmd/dinterpret.c
+++ b/gcc/d/dmd/dinterpret.c
@@ -6053,9 +6053,16 @@ public:
         result = (*se->elements)[i];
         if (!result)
         {
-            e->error("Internal Compiler Error: null field %s", v->toChars());
-            result = CTFEExp::cantexp;
-            return;
+            // https://issues.dlang.org/show_bug.cgi?id=19897
+            // Zero-length fields don't have an initializer.
+            if (v->type->size() == 0)
+                result = voidInitLiteral(e->type, v).copy();
+            else
+            {
+                e->error("Internal Compiler Error: null field %s", v->toChars());
+                result = CTFEExp::cantexp;
+                return;
+            }
         }
         if (result->op == TOKvoid)
         {
diff --git a/gcc/testsuite/gdc.test/fail_compilation/fail19897.d b/gcc/testsuite/gdc.test/fail_compilation/fail19897.d
new file mode 100644
index 00000000000..8dd4e149a87
--- /dev/null
+++ b/gcc/testsuite/gdc.test/fail_compilation/fail19897.d
@@ -0,0 +1,13 @@
+// PERMUTE_ARGS:
+/*
+TEST_OUTPUT
+---
+fail_compilation/fail19897.d(10): Error: cannot implicitly convert expression `[]` of type `const(char[0])` to `const(char)`
+---
+*/
+struct S
+{
+    char[0] x;
+}
+const a = S('a');
+const char c = a.x;