fix #11675, problem accessing fields of type Union()

src/cgutils.cpp

@@ -1287,6 +1287,10 @@ static Value *emit_getfield_knownidx(Value *strct, unsigned idx, jl_datatype_t *
     jl_value_t *jfty = jl_field_type(jt,idx);
     Type *elty = julia_type_to_llvm(jfty);
     assert(elty != NULL);
+    if (jfty == jl_bottom_type) {
+        raise_exception_unless(ConstantInt::get(T_int1,0), prepare_global(jlundeferr_var), ctx);
+        return UndefValue::get(jl_pvalue_llvmt);
+    }
     if (elty == T_void)
         return ghostValue(jfty);
     Value *fldv = NULL;

src/codegen.cpp

@@ -2142,13 +2142,7 @@ static Value *emit_known_call(jl_value_t *ff, jl_value_t **args, size_t nargs,
     else if (f->fptr == &jl_f_throw && nargs==1) {
         Value *arg1 = boxed(emit_expr(args[1], ctx), ctx);
         JL_GC_POP();
-#ifdef LLVM37
-        builder.CreateCall(prepare_call(jlthrow_line_func), {arg1,
-                            ConstantInt::get(T_int32, ctx->lineno)});
-#else
-        builder.CreateCall2(prepare_call(jlthrow_line_func), arg1,
-                            ConstantInt::get(T_int32, ctx->lineno));
-#endif
+        raise_exception_unless(ConstantInt::get(T_int1,0), arg1, ctx);
         return V_null;
     }
     else if (f->fptr == &jl_f_arraylen && nargs==1) {

test/core.jl

@@ -2939,3 +2939,15 @@ function f11295(x...)
     call = Expr(x...)
 end
 @test isa(f11295(:a,:b), Expr)
+
+# issue #11675
+immutable T11675{T}
+    x::T
+    T11675() = new()
+end
+let x = T11675{Union()}()
+    function f(x)
+        x.x + 1
+    end
+    @test_throws UndefRefError f(x)
+end

test/nullable.jl

@@ -272,3 +272,6 @@ end
 @test isnull(convert(Nullable, nothing))
 @test isnull(convert(Nullable{Int}, nothing))
 @test isa(convert(Nullable{Int}, nothing), Nullable{Int})
+
+# issue #11675
+@test repr(Nullable()) == "Nullable{Union()}()"