Merge pull request #3162 from 9rnsr/fix11447

[REG2.065a] Issue 11447 - Closure provide bogus values

src/func.c

@@ -3796,8 +3796,15 @@ bool FuncDeclaration::needsCodegen()
 {
     assert(semanticRun == PASSsemantic3done);
 
-    if (!isInstantiated() && inNonRoot())
-        return false;
+    for (FuncDeclaration *fd = this; fd; )
+    {
+        if (!fd->isInstantiated() && fd->inNonRoot())
+            return false;
+        if (fd->isNested())
+            fd = fd->toParent2()->isFuncDeclaration();
+        else
+            break;
+    }
 
     if (global.params.useUnitTests ||
         global.params.allInst ||

test/runnable/imports/c11447.d

@@ -0,0 +1,66 @@
+template map(fun...)
+{
+    auto map(Range)(Range r)
+    {
+        return MapResult!(fun, Range)(r);
+    }
+}
+private struct MapResult(alias fun, R)
+{
+    R _input;
+    this(R input) { _input = input; }
+    @property bool empty() { return _input.length == 0; }
+    @property auto ref front() { return fun(_input[0]); }
+    void popFront() { _input = _input[1..$]; }
+}
+
+class A {}
+
+struct TemplateInstancier
+{
+    auto instanciateFromResolvedArgs(A a)
+    {
+        auto bs = [B(a)];
+
+        static A gladeulfeurah;
+        gladeulfeurah = a;
+
+        auto r = bs.map!(
+            b => b.apply!(
+                function string() { assert(0); },
+                delegate string(i) {
+                    assert(a is gladeulfeurah, "tagazok");
+                    return "";
+                }
+            )
+        );
+
+        foreach (e; r) {}
+    }
+}
+
+enum Tag { Undefined, A, }
+
+struct B
+{
+    A a;
+    Tag tag;
+
+    this(A a)
+    {
+        tag = Tag.A;
+        this.a = a;
+    }
+}
+
+auto apply(alias undefinedHandler, alias handler)(B b)
+{
+    final switch(b.tag) with(Tag)
+    {
+        case Undefined :
+            return undefinedHandler();
+
+        case A :
+            return handler(b.a);
+    }
+}

test/runnable/test11447c.d

@@ -0,0 +1,11 @@
+// COMPILE_SEPARATELY
+// EXTRA_SOURCES: imports/c11447.d
+// PERMUTE_ARGS: -allinst -w -debug -gc
+
+import imports.c11447;
+
+void main()
+{
+    auto a = new A();
+    TemplateInstancier().instanciateFromResolvedArgs(a);
+}