diff --git a/pmd-lua/src/test/resources/net/sourceforge/pmd/lang/lua/cpd/testdata/regressionTest.lua b/pmd-lua/src/test/resources/net/sourceforge/pmd/lang/lua/cpd/testdata/regressionTest.lua
index 6b46463859..1c391a37a6 100644
--- a/pmd-lua/src/test/resources/net/sourceforge/pmd/lang/lua/cpd/testdata/regressionTest.lua
+++ b/pmd-lua/src/test/resources/net/sourceforge/pmd/lang/lua/cpd/testdata/regressionTest.lua
@@ -8,17 +8,19 @@ local _notVariable = not x
 local _length = #{x}
 export type Function<T... = ...any> = (...any) -> T...
 
-return function (req, ...: boolean): ({[string|number]: any}, string, Function<...any>)
+return function <T>(req, ...: boolean): ({[string|number]: T}, string, Function<...any>)
   local body = string.format("%s %s\n", req.method, req.path)
   local res = {
     code = 200,
     { "Content-Type", "text/plain" },
     { "Content-Length", #body } :: Array<any>,
   } :: { [any]: number | Array<string | boolean> }
-  if req.keepAlive then
-    res[#res + 1] = { "Connection", "Keep-Alive" }
-    res[#res + 2] = { ... }
+  if (req :: any).keepAlive then
+    local socketType: "Connection" | "Pingback" | "" = "" :: ""
+    socketType = "Connection" :: "Connection"
+    res[#res + 1] = { socketType :: string, "Keep-Alive" }
+    res[#res - 2] = { ... }
   end
 
-  return res, body, function(...): ...any return ... end
+  return (res :: any) :: { T }, body, function(...): ...any return ... end
 end
\ No newline at end of file
diff --git a/pmd-lua/src/test/resources/net/sourceforge/pmd/lang/lua/cpd/testdata/regressionTest.txt b/pmd-lua/src/test/resources/net/sourceforge/pmd/lang/lua/cpd/testdata/regressionTest.txt
index f02a9b767c..2be84bbb8a 100644
--- a/pmd-lua/src/test/resources/net/sourceforge/pmd/lang/lua/cpd/testdata/regressionTest.txt
+++ b/pmd-lua/src/test/resources/net/sourceforge/pmd/lang/lua/cpd/testdata/regressionTest.txt
@@ -67,27 +67,30 @@ L9
 L11
     [return]                                1         6
     [function]                              8         15
-    [(]                                     17        17
-    [req]                                   18        20
-    [,]                                     21        21
-    [...]                                   23        25
-    [:]                                     26        26
-    [boolean]                               28        34
-    [)]                                     35        35
-    [:]                                     36        36
-    [(]                                     38        38
-    [{]                                     39        39
-    [\[]                                    40        40
-    [string|number]                         41        53
-    [\]]                                    54        54
-    [:]                                     55        55
-    [any]                                   57        59
-    [}]                                     60        60
-    [,]                                     61        61
-    [string]                                63        68
-    [,]                                     69        69
-    [Function<...any>]                      71        86
-    [)]                                     87        87
+    [<]                                     17        17
+    [T]                                     18        18
+    [>]                                     19        19
+    [(]                                     20        20
+    [req]                                   21        23
+    [,]                                     24        24
+    [...]                                   26        28
+    [:]                                     29        29
+    [boolean]                               31        37
+    [)]                                     38        38
+    [:]                                     39        39
+    [(]                                     41        41
+    [{]                                     42        42
+    [\[]                                    43        43
+    [string|number]                         44        56
+    [\]]                                    57        57
+    [:]                                     58        58
+    [T]                                     60        60
+    [}]                                     61        61
+    [,]                                     62        62
+    [string]                                64        69
+    [,]                                     70        70
+    [Function<...any>]                      72        87
+    [)]                                     88        88
 L12
     [local]                                 3         7
     [body]                                  9         12
@@ -152,11 +155,34 @@ L17
     [}]                                     50        50
 L18
     [if]                                    3         4
-    [req]                                   6         8
-    [.]                                     9         9
-    [keepAlive]                             10        18
-    [then]                                  20        23
+    [(]                                     6         6
+    [req]                                   7         9
+    [::]                                    11        12
+    [any]                                   14        16
+    [)]                                     17        17
+    [.]                                     18        18
+    [keepAlive]                             19        27
+    [then]                                  29        32
 L19
+    [local]                                 5         9
+    [socketType]                            11        20
+    [:]                                     21        21
+    ["Connection"]                          23        34
+    [|]                                     36        36
+    ["Pingback"]                            38        47
+    [|]                                     49        49
+    [""]                                    51        52
+    [=]                                     54        54
+    [""]                                    56        57
+    [::]                                    59        60
+    [""]                                    62        63
+L20
+    [socketType]                            5         14
+    [=]                                     16        16
+    ["Connection"]                          18        29
+    [::]                                    31        32
+    ["Connection"]                          34        45
+L21
     [res]                                   5         7
     [\[]                                    8         8
     [#]                                     9         9
@@ -166,38 +192,48 @@ L19
     [\]]                                    17        17
     [=]                                     19        19
     [{]                                     21        21
-    ["Connection"]                          23        34
-    [,]                                     35        35
-    ["Keep-Alive"]                          37        48
-    [}]                                     50        50
-L20
+    [socketType]                            23        32
+    [::]                                    34        35
+    [string]                                37        42
+    [,]                                     43        43
+    ["Keep-Alive"]                          45        56
+    [}]                                     58        58
+L22
     [res]                                   5         7
     [\[]                                    8         8
     [#]                                     9         9
     [res]                                   10        12
-    [+]                                     14        14
+    [-]                                     14        14
     [2]                                     16        16
     [\]]                                    17        17
     [=]                                     19        19
     [{]                                     21        21
     [...]                                   23        25
     [}]                                     27        27
-L21
-    [end]                                   3         5
 L23
+    [end]                                   3         5
+L25
     [return]                                3         8
-    [res]                                   10        12
-    [,]                                     13        13
-    [body]                                  15        18
-    [,]                                     19        19
-    [function]                              21        28
-    [(]                                     29        29
-    [...)]                                  30        33
-    [:]                                     34        34
-    [...any]                                36        41
-    [return]                                43        48
-    [...]                                   50        52
-    [end]                                   54        56
-L24
+    [(]                                     10        10
+    [res]                                   11        13
+    [::]                                    15        16
+    [any]                                   18        20
+    [)]                                     21        21
+    [::]                                    23        24
+    [{]                                     26        26
+    [T]                                     28        28
+    [}]                                     30        30
+    [,]                                     31        31
+    [body]                                  33        36
+    [,]                                     37        37
+    [function]                              39        46
+    [(]                                     47        47
+    [...)]                                  48        51
+    [:]                                     52        52
+    [...any]                                54        59
+    [return]                                61        66
+    [...]                                   68        70
+    [end]                                   72        74
+L26
     [end]                                   1         3
 EOF