Fix ICE when printing an error message related to mappings

Changelog.md

@@ -11,6 +11,7 @@ Compiler Features:
 Bugfixes:
  * Commandline Interface: Fix extra newline character being appended to sources passed through standard input, affecting their hashes.
  * SMTChecker: Fix internal error in magic type access (``block``, ``msg``, ``tx``).
+ * TypeChecker: Fix internal error when using user defined value types in public library functions.
 
 
 

libsolidity/ast/Types.cpp

@@ -2559,6 +2559,11 @@ string UserDefinedValueType::toString(bool /* _short */) const
 	return *definition().annotation().canonicalName;
 }
 
+string UserDefinedValueType::canonicalName() const
+{
+	return *definition().annotation().canonicalName;
+}
+
 vector<tuple<string, Type const*>> UserDefinedValueType::makeStackItems() const
 {
 	return underlyingType().stackItems();

libsolidity/ast/Types.h

@@ -1141,7 +1141,7 @@ public:
 	}
 
 	std::string toString(bool _short) const override;
-	std::string canonicalName() const override { solAssert(false, ""); }
+	std::string canonicalName() const override;
 	std::string signatureInExternalFunction(bool) const override { solAssert(false, ""); }
 
 protected:

test/libsolidity/semanticTests/types/mapping/user_defined_types_mapping_storage.sol

@@ -0,0 +1,28 @@
+type A is uint;
+type B is uint;
+
+library L {
+  function f(mapping(A=>B) storage _m, B _v) public { _m[A.wrap(uint(2))] = _v; }
+  function f(mapping(uint=>uint) storage _m, uint _v) public { _m[uint(3)] = _v; }
+}
+
+contract C {
+	mapping(uint=>uint) uintMap;
+	mapping(A=>B) abMap;
+
+	function testAB() public returns (bool) {
+		L.f(abMap, B.wrap(3));
+		return B.unwrap(abMap[A.wrap(uint(2))]) == 3;
+	}
+	function testUint() public returns (bool) {
+		L.f(uintMap, 4);
+		return uintMap[3] == 4;
+	}
+}
+
+// ====
+// compileViaYul: also
+// ----
+// library: L
+// testAB() -> true
+// testUint() -> true

test/libsolidity/syntaxTests/types/mapping/int_mapping.sol

@@ -0,0 +1,5 @@
+library L {
+  function f(mapping(uint=>uint) memory) public {}
+}
+// ----
+// TypeError 4061: (25-51): Type mapping(uint256 => uint256) is only valid in storage because it contains a (nested) mapping.

test/libsolidity/syntaxTests/types/mapping/user_defined_types_mapping_memory.sol

@@ -0,0 +1,6 @@
+type T is uint;
+library L {
+  function f(mapping(T=>T) memory) public {}
+}
+// ----
+// TypeError 4061: (41-61): Type mapping(T => T) is only valid in storage because it contains a (nested) mapping.