Rewrite of the antlr grammar.

test/libsolidity/syntaxTests/parsing/constructor_internal_internal.sol

@@ -0,0 +1,5 @@
+contract C {
+  constructor() internal internal {}
+}
+// ----
+// ParserError 9439: (38-46): Visibility already specified as "internal".

test/libsolidity/syntaxTests/parsing/constructor_internal_public.sol

@@ -0,0 +1,5 @@
+contract C {
+  constructor() internal public {}
+}
+// ----
+// ParserError 9439: (38-44): Visibility already specified as "internal".

test/libsolidity/syntaxTests/parsing/constructor_payable_payable.sol

@@ -0,0 +1,5 @@
+contract C {
+  constructor() payable payable {}
+}
+// ----
+// ParserError 9680: (37-44): State mutability already specified as "payable".

test/libsolidity/syntaxTests/parsing/constructor_public_internal.sol

@@ -0,0 +1,5 @@
+contract C {
+  constructor() public internal {}
+}
+// ----
+// ParserError 9439: (36-44): Visibility already specified as "public".

test/libsolidity/syntaxTests/parsing/constructor_public_public.sol

@@ -0,0 +1,5 @@
+contract C {
+  constructor() public public {}
+}
+// ----
+// ParserError 9439: (36-42): Visibility already specified as "public".

test/libsolidity/syntaxTests/parsing/function_type_multiple_mutability.sol

@@ -0,0 +1,7 @@
+contract C {
+  function f() public pure {
+    function() pure pure g;
+  }
+}
+// ----
+// ParserError 9680: (62-66): State mutability already specified as "pure".

test/libsolidity/syntaxTests/parsing/function_type_multiple_visibility.sol

@@ -0,0 +1,7 @@
+contract C {
+  function f() public pure {
+    function() public public g;
+  }
+}
+// ----
+// ParserError 9439: (64-70): Visibility already specified as "public".