diff --git a/gcc/d/decl.cc b/gcc/d/decl.cc
index bed16323fec5fee09bb0ebab8615a03e706f792e..35081083cd6f33e8d02169581448cc85b707a239 100644
--- a/gcc/d/decl.cc
+++ b/gcc/d/decl.cc
@@ -1028,7 +1028,8 @@ build_decl_tree (Dsymbol *d)
   input_location = saved_location;
 }
 
-/* Returns true if function FD is defined or instantiated in a root module.  */
+/* Returns true if function FD, or any lexically enclosing scope function of FD
+   is defined or instantiated in a root module.  */
 
 static bool
 function_defined_in_root_p (FuncDeclaration *fd)
@@ -1037,9 +1038,11 @@ function_defined_in_root_p (FuncDeclaration *fd)
   if (md && md->isRoot ())
     return true;
 
-  TemplateInstance *ti = fd->isInstantiated ();
-  if (ti && ti->minst && ti->minst->isRoot ())
-    return true;
+  for (TemplateInstance *ti = fd->isInstantiated (); ti != NULL; ti = ti->tinst)
+    {
+      if (ti->minst && ti->minst->isRoot ())
+	return true;
+    }
 
   return false;
 }
@@ -1067,7 +1070,8 @@ function_needs_inline_definition_p (FuncDeclaration *fd)
 
   /* Check whether function will be regularly defined later in the current
      translation unit.  */
-  if (function_defined_in_root_p (fd))
+  Module *md = fd->getModule ();
+  if (md && md->isRoot ())
     return false;
 
   /* Non-inlineable functions are always external.  */
diff --git a/gcc/testsuite/gdc.dg/torture/imports/pr108055conv.d b/gcc/testsuite/gdc.dg/torture/imports/pr108055conv.d
new file mode 100644
index 0000000000000000000000000000000000000000..93ebba747b17d9694161caa180d4b910a0a47f12
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/torture/imports/pr108055conv.d
@@ -0,0 +1,26 @@
+module imports.pr108055conv;
+
+T toStr(T, S)(S src)
+{
+    static if (is(typeof(T.init[0]) E))
+    {
+        struct Appender
+        {
+            inout(E)[] data;
+        }
+
+        import imports.pr108055spec;
+        import imports.pr108055write;
+
+        auto w = Appender();
+        FormatSpec!E f;
+        formatValue(w, src, f);
+        return w.data;
+    }
+}
+
+T to(T, A)(A args)
+{
+    return toStr!T(args);
+}
+
diff --git a/gcc/testsuite/gdc.dg/torture/imports/pr108055spec.d b/gcc/testsuite/gdc.dg/torture/imports/pr108055spec.d
new file mode 100644
index 0000000000000000000000000000000000000000..801c581051621eba645effc9f402b39f32f43905
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/torture/imports/pr108055spec.d
@@ -0,0 +1,18 @@
+module imports.pr108055spec;
+
+template Unqual(T : const U, U)
+{
+    alias Unqual = U;
+}
+
+template FormatSpec(Char)
+if (!is(Unqual!Char == Char))
+{
+    alias FormatSpec = FormatSpec!(Unqual!Char);
+}
+
+struct FormatSpec(Char)
+if (is(Unqual!Char == Char))
+{
+    const(Char)[] nested;
+}
diff --git a/gcc/testsuite/gdc.dg/torture/imports/pr108055write.d b/gcc/testsuite/gdc.dg/torture/imports/pr108055write.d
new file mode 100644
index 0000000000000000000000000000000000000000..fe41d7baa7cfed0eba81b31f6b85fc5953485364
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/torture/imports/pr108055write.d
@@ -0,0 +1,19 @@
+module imports.pr108055write;
+import imports.pr108055spec;
+
+void formatValueImpl(Writer, T, Char)(ref Writer , const(T) ,
+                                      scope const ref FormatSpec!Char )
+{
+    T val;
+    char spec;
+
+    (ref val) @trusted {
+        return (cast(const char*) &val)[0 .. val.sizeof];
+    }(val);
+
+}
+
+void formatValue(Writer, T, Char)(Writer w, T val, Char f)
+{
+    formatValueImpl(w, val, f);
+}
diff --git a/gcc/testsuite/gdc.dg/torture/pr108055.d b/gcc/testsuite/gdc.dg/torture/pr108055.d
new file mode 100644
index 0000000000000000000000000000000000000000..c4ffad26d1e3a67e4835e225a39f76649eb9856b
--- /dev/null
+++ b/gcc/testsuite/gdc.dg/torture/pr108055.d
@@ -0,0 +1,12 @@
+// { dg-do link }
+// { dg-additional-files "imports/pr108055conv.d imports/pr108055spec.d imports/pr108055write.d" }
+// { dg-additional-options "-I[srcdir] -fno-druntime" }
+import imports.pr108055conv;
+
+extern(C) int main()
+{
+    float zis;
+    static if (is(typeof(to!string(&zis))))
+        to!string(&zis);
+    return 0;
+}