If a declaration shadows several others, group them together

test/libsolidity/syntaxTests/multiSource/free_function_resolution_override_virtual.sol

@@ -16,5 +16,4 @@ contract D is C {
 // ----
 // Warning 2519: (s1.sol:65-134): This declaration shadows an existing declaration.
 // Warning 2519: (s2.sol:85-155): This declaration shadows an existing declaration.
-// Warning 2519: (s2.sol:85-155): This declaration shadows an existing declaration.
 // DeclarationError 1686: (s2.sol:17-64): Function with same name and parameter types defined twice.

test/libsolidity/syntaxTests/scoping/name_pseudo_shadowing2.sol

@@ -0,0 +1,7 @@
+contract test {
+    function e() external { }
+    function f() public pure { uint e; e = 0; }
+    function e(int) external { }
+}
+// ----
+// Warning 8760: (77-83): This declaration has the same name as another declaration.

test/libsolidity/syntaxTests/scoping/name_shadowing3.sol

@@ -0,0 +1,10 @@
+function e() {}
+contract test {
+    function f() pure public { uint e; uint g; uint h; e = g = h = 0; }
+    function g() pure public {}
+}
+function h() {}
+// ----
+// Warning 2519: (63-69): This declaration shadows an existing declaration.
+// Warning 2519: (71-77): This declaration shadows an existing declaration.
+// Warning 2519: (79-85): This declaration shadows an existing declaration.