diff --git a/com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/Combine.java b/com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/Combine.java
index fcfc475523f28c9fc75c8c8235a82d79b4f1a594..4cbfd06eec2158522d899cf2380d7c8792dfa3c0 100644
--- a/com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/Combine.java
+++ b/com.oracle.truffle.r.nodes.builtin/src/com/oracle/truffle/r/nodes/builtin/base/Combine.java
@@ -70,13 +70,18 @@ import com.oracle.truffle.r.runtime.builtins.RBuiltin;
 import com.oracle.truffle.r.runtime.data.RArgsValuesAndNames;
 import com.oracle.truffle.r.runtime.data.RAttributesLayout;
 import com.oracle.truffle.r.runtime.data.RDataFactory;
+import com.oracle.truffle.r.runtime.data.RExpression;
+import com.oracle.truffle.r.runtime.data.RFunction;
 import com.oracle.truffle.r.runtime.data.RLanguage;
 import com.oracle.truffle.r.runtime.data.RList;
 import com.oracle.truffle.r.runtime.data.RNull;
+import com.oracle.truffle.r.runtime.data.RS4Object;
 import com.oracle.truffle.r.runtime.data.RStringVector;
+import com.oracle.truffle.r.runtime.data.RSymbol;
 import com.oracle.truffle.r.runtime.data.RVector;
 import com.oracle.truffle.r.runtime.data.model.RAbstractVector;
 import com.oracle.truffle.r.runtime.data.nodes.VectorAccess;
+import com.oracle.truffle.r.runtime.env.REnvironment;
 import com.oracle.truffle.r.runtime.nodes.RBaseNode;
 import com.oracle.truffle.r.runtime.ops.na.NACheck;
 
@@ -112,7 +117,15 @@ public abstract class Combine extends RBuiltinNode.Arg2 {
     public abstract Object executeCombine(Object value, Object recursive);
 
     protected boolean isSimpleArguments(RArgsValuesAndNames args) {
-        return !signatureHasNames(args.getSignature()) && args.getLength() == 1 && !(args.getArgument(0) instanceof RAbstractVector) && !RRuntime.isForeignObject(args.getArgument(0));
+        return !signatureHasNames(args.getSignature()) &&
+                        args.getLength() == 1 &&
+                        !(args.getArgument(0) instanceof RAbstractVector) &&
+                        !(args.getArgument(0) instanceof REnvironment) &&
+                        !(args.getArgument(0) instanceof RFunction) &&
+                        !(args.getArgument(0) instanceof RLanguage) &&
+                        !(args.getArgument(0) instanceof RSymbol) &&
+                        !(args.getArgument(0) instanceof RS4Object) &&
+                        !RRuntime.isForeignObject(args.getArgument(0));
     }
 
     @Specialization(guards = {"isSimpleArguments(args)", "!recursive"})
diff --git a/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/ExpectedTestOutput.test b/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/ExpectedTestOutput.test
index 8ad6b28bbead4b239ae670cd2e29eabd6202b81f..13ee304a4dd986aa243cc5fd205000730482dfc4 100644
--- a/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/ExpectedTestOutput.test
+++ b/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/ExpectedTestOutput.test
@@ -11567,6 +11567,59 @@ NULL
 Warning message:
 In body(argv[[1]]) : argument is not a function
 
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#c(as.expression(1))
+expression(1)
+
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#c(as.expression(1), as.expression(1))
+expression(1, 1)
+
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#c(as.symbol(1))
+[[1]]
+`1`
+
+
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#c(as.symbol(1), as.symbol(1))
+[[1]]
+`1`
+
+[[2]]
+`1`
+
+
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#c(environment())
+[[1]]
+<environment: R_GlobalEnv>
+
+
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#c(environment(), environment())
+[[1]]
+<environment: R_GlobalEnv>
+
+[[2]]
+<environment: R_GlobalEnv>
+
+
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#c(x~a)
+[[1]]
+x ~ a
+
+
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#c(x~a, x~b)
+[[1]]
+x ~ a
+
+[[2]]
+x ~ b
+
+
 ##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
 #typeof(c(substitute(graphics::par), list(as.symbol('a'))))
 [1] "list"
@@ -12179,6 +12232,16 @@ x y
 #{ f <- function() { }; length(c(f, 2)) == 2 }
 [1] TRUE
 
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#{ f <- function(){}; l <- c(f); print(is.list(l)); identical(l[[1]], f) }
+[1] TRUE
+[1] TRUE
+
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#{ f <- function(){}; l <- c(f, f); print(is.list(l)); identical(l[[1]], f) }
+[1] TRUE
+[1] TRUE
+
 ##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
 #{ f <- function(x,y) { c(x,y) } ; f(1,1) ; f(1, TRUE) ; f(NULL, NULL) }
 NULL
@@ -12198,6 +12261,30 @@ Slot "d":
 [1] 42
 
 
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#{ setClass('foo', representation(bar = 'ANY')); c(new('foo', bar=1)) }
+[[1]]
+An object of class "foo"
+Slot "bar":
+[1] 1
+
+
+
+##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
+#{ setClass('foo', representation(bar = 'ANY')); c(new('foo', bar=1), new('foo', bar=1)) }
+[[1]]
+An object of class "foo"
+Slot "bar":
+[1] 1
+
+
+[[2]]
+An object of class "foo"
+Slot "bar":
+[1] 1
+
+
+
 ##com.oracle.truffle.r.test.builtins.TestBuiltin_c.testCombine#
 #{ typeof(c(as.symbol("foo"), 42)) }
 [1] "list"
diff --git a/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/builtins/TestBuiltin_c.java b/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/builtins/TestBuiltin_c.java
index 7dd4697df4814f8358a53ecbcb52206a1756bd5a..974a0d5f7ba803258b3236f09f5c6ecdfc3a8532 100644
--- a/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/builtins/TestBuiltin_c.java
+++ b/com.oracle.truffle.r.test/src/com/oracle/truffle/r/test/builtins/TestBuiltin_c.java
@@ -4,7 +4,7 @@
  * http://www.gnu.org/licenses/gpl-2.0.html
  *
  * Copyright (c) 2012-2014, Purdue University
- * Copyright (c) 2013, 2017, Oracle and/or its affiliates
+ * Copyright (c) 2013, 2018, Oracle and/or its affiliates
  *
  * All rights reserved.
  */
@@ -541,6 +541,19 @@ public class TestBuiltin_c extends TestBase {
         assertEval("{ x<-c(a=42); y<-c(b=7); z<-c(x,y); w<-names(z); w[[1]]<-\"c\"; z }");
 
         assertEval("typeof(c(substitute(graphics::par), list(as.symbol('a'))))");
+
+        assertEval("c(x~a)");
+        assertEval("c(x~a, x~b)");
+        assertEval("{ f <- function(){}; l <- c(f); print(is.list(l)); identical(l[[1]], f) }");
+        assertEval("{ f <- function(){}; l <- c(f, f); print(is.list(l)); identical(l[[1]], f) }");
+        assertEval("c(environment())");
+        assertEval("c(environment(), environment())");
+        assertEval("c(as.expression(1))");
+        assertEval("c(as.expression(1), as.expression(1))");
+        assertEval("c(as.symbol(1))");
+        assertEval("c(as.symbol(1), as.symbol(1))");
+        assertEval("{ setClass('foo', representation(bar = 'ANY')); c(new('foo', bar=1)) }");
+        assertEval("{ setClass('foo', representation(bar = 'ANY')); c(new('foo', bar=1), new('foo', bar=1)) }");
     }
 
     @Test