4089 – crash when creating JSON output for incomplete struct

This one-line code:
/// test.d
struct X;
causes a crash when executing
dmd -c -X test.d
Here's a patch
Index: json.c
===================================================================
--- json.c	(revision 432)
+++ json.c	(working copy)
@@ -307,16 +307,19 @@
 }
 }
 
- JsonString(buf, Pmembers);
- buf->writestring(" : [\n");
- size_t offset = buf->offset;
- for (int i = 0; i < members->dim; i++)
- { Dsymbol *s = (Dsymbol *)members->data[i];
- if (offset != buf->offset)
- { buf->writestring(",\n");
- offset = buf->offset;
+ if(members)
+ {
+ JsonString(buf, Pmembers);
+ buf->writestring(" : [\n");
+ size_t offset = buf->offset;
+ for (int i = 0; i < members->dim; i++)
+ { Dsymbol *s = (Dsymbol *)members->data[i];
+ if (offset != buf->offset)
+ { buf->writestring(",\n");
+ offset = buf->offset;
+ }
+ s->toJsonBuffer(buf);
 }
- s->toJsonBuffer(buf);
 }
 JsonRemoveComma(buf);
 buf->writestring("]\n");

sorry, the patch produced wrong brackets. Here's a better version:
Index: json.c
===================================================================
--- json.c	(revision 432)
+++ json.c	(working copy)
@@ -307,19 +307,23 @@
 }
 }
 
- JsonString(buf, Pmembers);
- buf->writestring(" : [\n");
- size_t offset = buf->offset;
- for (int i = 0; i < members->dim; i++)
- { Dsymbol *s = (Dsymbol *)members->data[i];
- if (offset != buf->offset)
- { buf->writestring(",\n");
- offset = buf->offset;
+ if(members)
+ {
+ JsonString(buf, Pmembers);
+ buf->writestring(" : [\n");
+ size_t offset = buf->offset;
+ for (int i = 0; i < members->dim; i++)
+ { Dsymbol *s = (Dsymbol *)members->data[i];
+ if (offset != buf->offset)
+ { buf->writestring(",\n");
+ offset = buf->offset;
+ }
+ s->toJsonBuffer(buf);
 }
- s->toJsonBuffer(buf);
+ JsonRemoveComma(buf);
+ buf->writestring("]\n");
 }
 JsonRemoveComma(buf);
- buf->writestring("]\n");
 
 buf->writestring("}\n");
 }

An almost identical patch is also needed for incomplete EnumDeclarations:
Index: json.c
===================================================================
--- json.c	(revision 433)
+++ json.c	(working copy)
@@ -386,19 +386,23 @@
 if (memtype)
 JsonProperty(buf, "base", memtype->toChars());
 
- JsonString(buf, Pmembers);
- buf->writestring(" : [\n");
- size_t offset = buf->offset;
- for (int i = 0; i < members->dim; i++)
- { Dsymbol *s = (Dsymbol *)members->data[i];
- if (offset != buf->offset)
- { buf->writestring(",\n");
- offset = buf->offset;
+ if(members)
+ {
+ JsonString(buf, Pmembers);
+ buf->writestring(" : [\n");
+ size_t offset = buf->offset;
+ for (int i = 0; i < members->dim; i++)
+ { Dsymbol *s = (Dsymbol *)members->data[i];
+ if (offset != buf->offset)
+ { buf->writestring(",\n");
+ offset = buf->offset;
+ }
+ s->toJsonBuffer(buf);
 }
- s->toJsonBuffer(buf);
+ JsonRemoveComma(buf);
+ buf->writestring("]\n");
 }
 JsonRemoveComma(buf);
- buf->writestring("]\n");
 
 buf->writestring("}\n");
 }

Fixed DMD2.044