re PR d/90762 (ICE in resolvePropertiesX, at d/dmd/expression.c:251)

	PR d/90762
d/dmd: Merge upstream dmd b0cd59177

Fixes segmentation fault in resolvePropertiesX.

Reviewed-on: https://github.com/dlang/dmd/pull/10006

From-SVN: r272347

gcc/d/dmd/MERGE

-d912f4e495412b67f0a2e3b07f645909cfee0212
+b0cd591770fefb4db6eaba89b7a548ef1e980f5c
 
 The first line of this file holds the git revision number of the last
 merge done from the dlang/dmd repository.

gcc/d/dmd/statementsem.c

@@ -3492,12 +3492,18 @@ public:
             }
 
             s->semantic(sc);
-            Module::addDeferredSemantic2(s);     // Bugzilla 14666
-            sc->insert(s);
-
-            for (size_t j = 0; j < s->aliasdecls.dim; j++)
+            // https://issues.dlang.org/show_bug.cgi?id=19942
+            // If the module that's being imported doesn't exist, don't add it to the symbol table
+            // for the current scope.
+            if (s->mod != NULL)
             {
-                sc->insert(s->aliasdecls[j]);
+                Module::addDeferredSemantic2(s);     // Bugzilla 14666
+                sc->insert(s);
+
+                for (size_t j = 0; j < s->aliasdecls.dim; j++)
+                {
+                    sc->insert(s->aliasdecls[j]);
+                }
             }
         }
         result = imps;

gcc/testsuite/gdc.test/compilable/traits.d

+// REQUIRED_ARGS:
+
+// This file is intended to contain all compilable traits-related tests in an
+// effort to keep the number of files in the `compilable` folder to a minimum.
+
+/******************************************/
+// https://issues.dlang.org/show_bug.cgi?id=19942
+
+static assert(!__traits(compiles, { a.init; }));
+static assert(!__traits(compiles, { import m : a; a.init; }));