diff --git a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.errors.txt b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.errors.txt
index 1d37b20a3b3..708f175c002 100644
--- a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.errors.txt
+++ b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.errors.txt
@@ -34,7 +34,7 @@ tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(138,13): error T
 tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(141,32): error TS1005: '{' expected.
 tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(143,13): error TS1005: 'try' expected.
 tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(159,24): error TS1109: Expression expected.
-tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(159,30): error TS1005: '(' expected.
+tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(159,30): error TS1005: '{' expected.
 tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(159,31): error TS2304: Cannot find name 'Property'.
 tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(166,13): error TS2365: Operator '+=' cannot be applied to types 'number' and 'void'.
 tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(180,40): error TS2447: The '^' operator is not allowed for boolean types. Consider using '!==' instead.
@@ -323,7 +323,7 @@ tests/cases/compiler/constructorWithIncompleteTypeAnnotation.ts(261,1): error TS
                            ~~~~~
 !!! error TS1109: Expression expected.
                                  ~
-!!! error TS1005: '(' expected.
+!!! error TS1005: '{' expected.
                                   ~~~~~~~~
 !!! error TS2304: Cannot find name 'Property'.
                 retVal += c.Member();
diff --git a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
index 8e9dc6da688..013692a4889 100644
--- a/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
+++ b/tests/baselines/reference/constructorWithIncompleteTypeAnnotation.js
@@ -441,7 +441,7 @@ var BasicFeatures = (function () {
         var xx = c;
         retVal += ;
         try { }
-        catch () { }
+        catch (_ignoredCatchParameter) { }
         Property;
         retVal += c.Member();
         retVal += xx.Foo() ? 0 : 1;
diff --git a/tests/baselines/reference/emitter.ignoredCatchParameter.esnext.js b/tests/baselines/reference/emitter.ignoredCatchParameter.esnext.js
new file mode 100644
index 00000000000..0f9254fd3cb
--- /dev/null
+++ b/tests/baselines/reference/emitter.ignoredCatchParameter.esnext.js
@@ -0,0 +1,11 @@
+//// [emitter.ignoredCatchParameter.esnext.ts]
+function fn() {
+    try {} catch {}
+}
+
+
+//// [emitter.ignoredCatchParameter.esnext.js]
+function fn() {
+    try { }
+    catch { }
+}
diff --git a/tests/baselines/reference/emitter.ignoredCatchParameter.esnext.symbols b/tests/baselines/reference/emitter.ignoredCatchParameter.esnext.symbols
new file mode 100644
index 00000000000..78838a33011
--- /dev/null
+++ b/tests/baselines/reference/emitter.ignoredCatchParameter.esnext.symbols
@@ -0,0 +1,7 @@
+=== tests/cases/conformance/emitter/esnext/noCatchParameter/emitter.ignoredCatchParameter.esnext.ts ===
+function fn() {
+>fn : Symbol(fn, Decl(emitter.ignoredCatchParameter.esnext.ts, 0, 0))
+
+    try {} catch {}
+}
+
diff --git a/tests/baselines/reference/emitter.ignoredCatchParameter.esnext.types b/tests/baselines/reference/emitter.ignoredCatchParameter.esnext.types
new file mode 100644
index 00000000000..06bf4ab2682
--- /dev/null
+++ b/tests/baselines/reference/emitter.ignoredCatchParameter.esnext.types
@@ -0,0 +1,7 @@
+=== tests/cases/conformance/emitter/esnext/noCatchParameter/emitter.ignoredCatchParameter.esnext.ts ===
+function fn() {
+>fn : () => void
+
+    try {} catch {}
+}
+
diff --git a/tests/baselines/reference/invalidTryStatements.errors.txt b/tests/baselines/reference/invalidTryStatements.errors.txt
index a2f8a7bac0c..08dc5f1dfa0 100644
--- a/tests/baselines/reference/invalidTryStatements.errors.txt
+++ b/tests/baselines/reference/invalidTryStatements.errors.txt
@@ -1,9 +1,10 @@
 tests/cases/conformance/statements/tryStatements/invalidTryStatements.ts(8,23): error TS1196: Catch clause variable cannot have a type annotation.
 tests/cases/conformance/statements/tryStatements/invalidTryStatements.ts(9,23): error TS1196: Catch clause variable cannot have a type annotation.
 tests/cases/conformance/statements/tryStatements/invalidTryStatements.ts(10,23): error TS1196: Catch clause variable cannot have a type annotation.
+tests/cases/conformance/statements/tryStatements/invalidTryStatements.ts(14,13): error TS2714: Duplicate identifier '_ignoredCatchParameter'. Compiler uses the parameter declaration '_ignoredCatchParameter' to bind ignored catched exceptions.
 
 
-==== tests/cases/conformance/statements/tryStatements/invalidTryStatements.ts (3 errors) ====
+==== tests/cases/conformance/statements/tryStatements/invalidTryStatements.ts (4 errors) ====
     function fn() {
         try {
         } catch (x) {
@@ -20,6 +21,13 @@ tests/cases/conformance/statements/tryStatements/invalidTryStatements.ts(10,23):
         try { } catch (y: string) { }
                           ~~~~~~
 !!! error TS1196: Catch clause variable cannot have a type annotation.
+    
+        
+        try { } catch { 
+            let _ignoredCatchParameter; // Should error since we downlevel emit this variable.
+                ~~~~~~~~~~~~~~~~~~~~~~
+!!! error TS2714: Duplicate identifier '_ignoredCatchParameter'. Compiler uses the parameter declaration '_ignoredCatchParameter' to bind ignored catched exceptions.
+        }
     }
     
     
\ No newline at end of file
diff --git a/tests/baselines/reference/invalidTryStatements.js b/tests/baselines/reference/invalidTryStatements.js
index 343ad6e0584..1436c83ae07 100644
--- a/tests/baselines/reference/invalidTryStatements.js
+++ b/tests/baselines/reference/invalidTryStatements.js
@@ -9,6 +9,11 @@ function fn() {
     try { } catch (z: any) { }
     try { } catch (a: number) { }
     try { } catch (y: string) { }
+
+    
+    try { } catch { 
+        let _ignoredCatchParameter; // Should error since we downlevel emit this variable.
+    }
 }
 
 
@@ -27,4 +32,8 @@ function fn() {
     catch (a) { }
     try { }
     catch (y) { }
+    try { }
+    catch (_ignoredCatchParameter) {
+        var _ignoredCatchParameter = void 0; // Should error since we downlevel emit this variable.
+    }
 }
diff --git a/tests/baselines/reference/invalidTryStatements2.errors.txt b/tests/baselines/reference/invalidTryStatements2.errors.txt
index f2e88cfdc22..e1d285b8c88 100644
--- a/tests/baselines/reference/invalidTryStatements2.errors.txt
+++ b/tests/baselines/reference/invalidTryStatements2.errors.txt
@@ -1,4 +1,3 @@
-tests/cases/conformance/statements/tryStatements/invalidTryStatements2.ts(3,13): error TS1005: '(' expected.
 tests/cases/conformance/statements/tryStatements/invalidTryStatements2.ts(6,5): error TS1005: 'try' expected.
 tests/cases/conformance/statements/tryStatements/invalidTryStatements2.ts(12,5): error TS1005: 'try' expected.
 tests/cases/conformance/statements/tryStatements/invalidTryStatements2.ts(13,5): error TS1005: 'try' expected.
@@ -6,12 +5,10 @@ tests/cases/conformance/statements/tryStatements/invalidTryStatements2.ts(22,5):
 tests/cases/conformance/statements/tryStatements/invalidTryStatements2.ts(26,5): error TS1005: 'try' expected.
 
 
-==== tests/cases/conformance/statements/tryStatements/invalidTryStatements2.ts (6 errors) ====
+==== tests/cases/conformance/statements/tryStatements/invalidTryStatements2.ts (5 errors) ====
     function fn() {
         try {
         } catch { // syntax error, missing '(x)'
-                ~
-!!! error TS1005: '(' expected.
         }
     
         catch(x) { } // error missing try
diff --git a/tests/baselines/reference/invalidTryStatements2.js b/tests/baselines/reference/invalidTryStatements2.js
index 118b607817a..44fb6bb7071 100644
--- a/tests/baselines/reference/invalidTryStatements2.js
+++ b/tests/baselines/reference/invalidTryStatements2.js
@@ -32,7 +32,7 @@ function fn2() {
 function fn() {
     try {
     }
-    catch () {
+    catch (_ignoredCatchParameter) {
     }
     try {
     }
diff --git a/tests/baselines/reference/tryStatements.js b/tests/baselines/reference/tryStatements.js
index 723014c1b52..da126cbcc6c 100644
--- a/tests/baselines/reference/tryStatements.js
+++ b/tests/baselines/reference/tryStatements.js
@@ -1,20 +1,19 @@
 //// [tryStatements.ts]
 function fn() {
-    try {
+    try { } catch { }
 
-    } catch (x) {
-        var x: any;
-    }
+    try { } catch (x) { var x: any; }
 
     try { } finally { }
 
-    try { }catch(z){ } finally { }
+    try { } catch(z) { } finally { }
 }
 
 //// [tryStatements.js]
 function fn() {
-    try {
-    }
+    try { }
+    catch (_ignoredCatchParameter) { }
+    try { }
     catch (x) {
         var x;
     }
diff --git a/tests/baselines/reference/tryStatements.symbols b/tests/baselines/reference/tryStatements.symbols
index 945ca2d9d88..cc014772665 100644
--- a/tests/baselines/reference/tryStatements.symbols
+++ b/tests/baselines/reference/tryStatements.symbols
@@ -2,17 +2,14 @@
 function fn() {
 >fn : Symbol(fn, Decl(tryStatements.ts, 0, 0))
 
-    try {
+    try { } catch { }
 
-    } catch (x) {
->x : Symbol(x, Decl(tryStatements.ts, 3, 13))
-
-        var x: any;
->x : Symbol(x, Decl(tryStatements.ts, 4, 11))
-    }
+    try { } catch (x) { var x: any; }
+>x : Symbol(x, Decl(tryStatements.ts, 3, 19))
+>x : Symbol(x, Decl(tryStatements.ts, 3, 27))
 
     try { } finally { }
 
-    try { }catch(z){ } finally { }
->z : Symbol(z, Decl(tryStatements.ts, 9, 17))
+    try { } catch(z) { } finally { }
+>z : Symbol(z, Decl(tryStatements.ts, 7, 18))
 }
diff --git a/tests/baselines/reference/tryStatements.types b/tests/baselines/reference/tryStatements.types
index 07bc3997d83..49e89dd79c0 100644
--- a/tests/baselines/reference/tryStatements.types
+++ b/tests/baselines/reference/tryStatements.types
@@ -2,17 +2,14 @@
 function fn() {
 >fn : () => void
 
-    try {
+    try { } catch { }
 
-    } catch (x) {
+    try { } catch (x) { var x: any; }
 >x : any
-
-        var x: any;
 >x : any
-    }
 
     try { } finally { }
 
-    try { }catch(z){ } finally { }
+    try { } catch(z) { } finally { }
 >z : any
 }