diff --git a/ivtest/ivltests/sv_typedef_fwd_base.v b/ivtest/ivltests/sv_typedef_fwd_base.v
new file mode 100644
index 000000000..46562aca9
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_base.v
@@ -0,0 +1,47 @@
+// Check that forward typedefs of basic types are supported
+
+`define check(val, exp) \
+  if (val != exp) begin \
+    $display("FAILED(%0d). '%s' expected ", `__LINE__, `"val`", exp, " got ", val, ); \
+    failed = 1'b1; \
+  end
+
+bit failed = 1'b0;
+
+module test;
+  typedef T1;
+  typedef T1; // Check forward typedef twice for the same type
+  typedef T2;
+  typedef T3;
+  typedef T4;
+
+  T1 x = -1;
+  T2 y = 1.23;
+  T3 z = "Hello";
+  T4 w;
+
+  typedef integer T1;
+  // There can be as many forward typedefs as we like, even after the type
+  // itself has already been declared.
+  typedef T1;
+  typedef T1;
+
+  typedef real T2;
+  typedef string T3;
+  typedef logic [1:0] T4[3:0];
+
+  initial begin
+    `check($bits(x), $bits(integer))
+    `check($bits(T1), $bits(integer))
+    `check(x, -1)
+    `check(y, 1.23)
+    `check(z, "Hello")
+    `check($unpacked_dimensions(w), 1)
+    `check($size(w), 4)
+
+    if (!failed) begin
+      $display("PASSED");
+    end
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_typedef_fwd_class.v b/ivtest/ivltests/sv_typedef_fwd_class.v
new file mode 100644
index 000000000..4a672f5c5
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_class.v
@@ -0,0 +1,46 @@
+// Check that forward typedefs of classes are supported
+
+module test;
+
+`define check(val, exp) \
+  if (val !== exp) begin \
+    $display("FAILED(%0d). '%s' expected %d, got %d", `__LINE__, `"val`", exp, val); \
+    failed = 1'b1; \
+  end
+
+  bit failed = 1'b0;
+
+  typedef class C;
+  typedef C;
+
+  C x;
+
+  class C;
+    int x;
+  endclass
+
+  C y;
+
+  // There can be as many forward typedefs as we like, even after the type
+  // itself has already been declared.
+  typedef C;
+  typedef class C;
+
+  C z;
+
+  initial begin
+    // Check they are all the same type and can be assigned to each other
+    x = y;
+    y = z;
+    z = x;
+
+    `check($bits(x.x), $bits(int));
+    `check($bits(y.x), $bits(int));
+    `check($bits(z.x), $bits(int));
+
+    if (!failed) begin
+      $display("PASSED");
+    end
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_typedef_fwd_enum1.v b/ivtest/ivltests/sv_typedef_fwd_enum1.v
new file mode 100644
index 000000000..6e3a90132
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_enum1.v
@@ -0,0 +1,44 @@
+// Check that forward enum typedefs are supported
+
+module test;
+
+`define check(val, exp) \
+  if (val !== exp) begin \
+    $display("FAILED(%0d). '%s' expected %0d, got %0d", `__LINE__, `"val`", exp, val); \
+    failed = 1'b1; \
+  end
+
+  bit failed = 1'b0;
+
+  typedef T;
+  typedef enum T;
+
+  T x;
+
+  typedef enum integer {
+    A, B
+  } T;
+
+  T y;
+
+  typedef enum T;
+  typedef T;
+
+  T z;
+
+  initial begin
+    // Check that they are all the same type and can be assigned to each other
+    x = y;
+    y = z;
+    z = x;
+
+    `check($bits(x), $bits(integer))
+    `check($bits(y), $bits(integer))
+    `check($bits(z), $bits(integer))
+
+    if (!failed) begin
+      $display("PASSED");
+    end
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_typedef_fwd_enum2.v b/ivtest/ivltests/sv_typedef_fwd_enum2.v
new file mode 100644
index 000000000..d4fc02400
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_enum2.v
@@ -0,0 +1,23 @@
+// Check that the base type of an enum can be a forward typedef
+
+module test;
+
+  typedef T1;
+
+  typedef enum T1 {
+    A, B
+  } T2;
+
+  typedef logic [31:0] T1;
+
+  T2 z;
+
+  initial begin
+    if ($bits(z) == 32) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_typedef_fwd_enum3.v b/ivtest/ivltests/sv_typedef_fwd_enum3.v
new file mode 100644
index 000000000..3668d26ba
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_enum3.v
@@ -0,0 +1,26 @@
+// Check that a forwarded enum typedef can be referenced in a class
+
+module test;
+
+  typedef T;
+
+  class C;
+    T x;
+  endclass
+
+  typedef enum integer {
+    X, Y
+  } T;
+
+  initial begin
+    C c;
+    c = new;
+
+    if ($bits(c.x) == 32) begin
+      $display("PASSED");
+    end else begin
+      $display("FAILED");
+    end
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_typedef_fwd_enum_fail.v b/ivtest/ivltests/sv_typedef_fwd_enum_fail.v
new file mode 100644
index 000000000..e05586e4e
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_enum_fail.v
@@ -0,0 +1,14 @@
+// Check that a enum can't be its own base type
+
+module test;
+
+  typedef T;
+  typedef enum T {
+    A, B
+  } T;
+
+  initial begin
+    $display("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_typedef_fwd_struct.v b/ivtest/ivltests/sv_typedef_fwd_struct.v
new file mode 100644
index 000000000..f3593462b
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_struct.v
@@ -0,0 +1,39 @@
+// Check that forward struct typedefs are supported
+
+module test;
+
+`define check(val, exp) \
+  if (val !== exp) begin \
+    $display("FAILED(%0d). '%s' expected %0d, got %0d", `__LINE__, `"val`", exp, val); \
+    failed = 1'b1; \
+  end
+
+  bit failed = 1'b0;
+
+  typedef T;
+  typedef struct T;
+
+  T x;
+
+  typedef struct packed {
+    int x;
+  } T;
+
+  T y;
+
+  typedef struct T;
+  typedef T;
+
+  T z;
+
+  initial begin
+    `check($bits(x), $bits(int))
+    `check($bits(y), $bits(int))
+    `check($bits(z), $bits(int))
+
+    if (!failed) begin
+      $display("PASSED");
+    end
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_typedef_fwd_struct_fail.v b/ivtest/ivltests/sv_typedef_fwd_struct_fail.v
new file mode 100644
index 000000000..eb680bd96
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_struct_fail.v
@@ -0,0 +1,18 @@
+// Check that it is an error to use a forwarded struct type as the type for the
+// member in the struct itself.
+
+module test;
+
+  typedef T;
+
+  typedef struct packed {
+    T x;
+  } T;
+
+  T x;
+
+  initial begin
+    $display("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_typedef_fwd_union.v b/ivtest/ivltests/sv_typedef_fwd_union.v
new file mode 100644
index 000000000..9356d9065
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_union.v
@@ -0,0 +1,41 @@
+// Check that forward typdes of unions are supported
+
+module test;
+
+`define check(val, exp) \
+  if (val !== exp) begin \
+    $display("FAILED(%0d). '%s' expected %0d, got %0d", `__LINE__, `"val`", exp, val); \
+    failed = 1'b1; \
+  end
+
+  bit failed = 1'b0;
+  typedef union T;
+  typedef T;
+
+  T x;
+
+  typedef union packed {
+    int x;
+    logic [3:0][7:0] y;
+  } T;
+
+  T y;
+
+  // There can be as many forward typedefs as we like, even after the type
+  // itself has already been declared.
+  typedef T;
+  typedef union T;
+
+  T z;
+
+  initial begin
+    `check($bits(x), $bits(int));
+    `check($bits(y), $bits(int));
+    `check($bits(z), $bits(int));
+
+    if (!failed) begin
+      $display("PASSED");
+    end
+  end
+
+endmodule
diff --git a/ivtest/ivltests/sv_typedef_fwd_union_fail.v b/ivtest/ivltests/sv_typedef_fwd_union_fail.v
new file mode 100644
index 000000000..b77dc13da
--- /dev/null
+++ b/ivtest/ivltests/sv_typedef_fwd_union_fail.v
@@ -0,0 +1,18 @@
+// Check that it is an error to use a forwarded union type as the type for the
+// members in the union itself.
+
+module test;
+
+  typedef T;
+
+  typedef union packed {
+    T x;
+  } T;
+
+  T x;
+
+  initial begin
+    $display("FAILED");
+  end
+
+endmodule
diff --git a/ivtest/regress-sv.list b/ivtest/regress-sv.list
index cf7a8f06a..7738d2119 100644
--- a/ivtest/regress-sv.list
+++ b/ivtest/regress-sv.list
@@ -720,6 +720,16 @@ sv_typedef_darray_base1	normal,-g2009		ivltests
 sv_typedef_darray_base2	normal,-g2009		ivltests
 sv_typedef_darray_base3	normal,-g2009		ivltests
 sv_typedef_darray_base4	normal,-g2009		ivltests
+sv_typedef_fwd_base	normal,-g2009		ivltests
+sv_typedef_fwd_class	normal,-g2009		ivltests
+sv_typedef_fwd_union	normal,-g2009		ivltests
+sv_typedef_fwd_union_fail CE,-g2009		ivltests
+sv_typedef_fwd_enum1	normal,-g2009		ivltests
+sv_typedef_fwd_enum2	normal,-g2009		ivltests
+sv_typedef_fwd_enum3	normal,-g2009		ivltests
+sv_typedef_fwd_enum_fail CE,-g2009		ivltests
+sv_typedef_fwd_struct	normal,-g2009		ivltests
+sv_typedef_fwd_struct_fail CE,-g2009		ivltests
 sv_typedef_nested_array normal,-g2009		ivltests
 sv_typedef_queue_base1	normal,-g2009		ivltests
 sv_typedef_queue_base2	normal,-g2009		ivltests
diff --git a/ivtest/regress-vlog95.list b/ivtest/regress-vlog95.list
index 30cbdc3e6..e520e2de3 100644
--- a/ivtest/regress-vlog95.list
+++ b/ivtest/regress-vlog95.list
@@ -302,6 +302,7 @@ sv_string5		CE,-g2009		ivltests
 sv_string6		CE,-g2009,-pallowsigned=1	ivltests
 sv_string7		CE,-g2009,-pallowsigned=1	ivltests
 sv_string7b		CE,-g2009,-pallowsigned=1	ivltests
+sv_typedef_fwd_base	CE,-g2009		ivltests
 vhdl_string_lim		CE,-g2005-sv,-pallowsigned=1,ivltests/vhdl_string_lim.vhd	ivltests
 vhdl_textio_write	CE,-g2005-sv,-pallowsigned=1,ivltests/vhdl_textio_write.vhd	ivltests
 vhdl_textio_read	CE,-g2005-sv,-pallowsigned=1,ivltests/vhdl_textio_read.vhd	ivltests
@@ -440,6 +441,8 @@ sv_port_default8	CE,-g2009,-pallowsigned=1	ivltests
 sv_port_default9	CE,-g2009		ivltests
 sv_ps_type_class1	CE,-g2009		ivltests
 sv_root_class		CE,-g2009		ivltests
+sv_typedef_fwd_class	CE,-g2009		ivltests
+sv_typedef_fwd_enum3	CE,-g2009		ivltests
 sv_typedef_scope3	CE,-g2009		ivltests
 sv_unit2b		CE,-g2009		ivltests
 sv_unit3b		CE,-g2009		ivltests