Show expected params on no method match

Signed-off-by: TheSilkMiner <thesilkminer@outlook.com>

Author: TheSilkMiner

CodeModel/src/main/java/org/openzen/zenscript/codemodel/FunctionHeader.java

@@ -48,7 +48,7 @@ public FunctionHeader(TypeID returnType, TypeID... parameterTypes) {
 		this.thrownType = null;
 
 		for (int i = 0; i < parameterTypes.length; i++)
-			parameters[i] = new FunctionParameter(parameterTypes[i], null);
+			parameters[i] = new FunctionParameter(parameterTypes[i], "param" + i);
 
 		minParameters = parameterTypes.length;
 		maxParameters = parameterTypes.length;

CodeModel/src/main/java/org/openzen/zenscript/codemodel/compilation/CompileErrors.java

@@ -6,6 +6,7 @@
 import org.openzen.zenscript.codemodel.OperatorType;
 import org.openzen.zenscript.codemodel.identifiers.MethodID;
 import org.openzen.zenscript.codemodel.identifiers.instances.MethodInstance;
+import org.openzen.zenscript.codemodel.type.BasicTypeID;
 import org.openzen.zenscript.codemodel.type.TypeID;
 
 import java.util.List;
@@ -255,13 +256,17 @@ public static CompileError ambiguousCall(List<FunctionHeader> candidates) {
 		return new CompileError(CompileExceptionCode.CALL_AMBIGUOUS, message.toString());
     }
 
-	public static CompileError noMethodMatched(List<FunctionHeader> candidates) {
+	public static CompileError noMethodMatched(List<FunctionHeader> candidates, List<TypeID> argumentTypes) {
+		FunctionHeader expectedHeader = new FunctionHeader(BasicTypeID.UNDETERMINED, argumentTypes.toArray(TypeID.NONE));
+
 		StringBuilder message = new StringBuilder("Method invocation invalid, none of these overloads match:");
 		for (FunctionHeader header : candidates) {
-			message.append("\n").append(header.toString());
-			// for (FunctionHeader candidate : candidateFunctions)
-			//   explanation.append(candidate.explainWhyIncompatible(scope, arguments)).append("\n");
+			message.append("\n - ").append(header.toString());
 		}
+		message.append("\nTarget overload should be compatible with header ").append(expectedHeader);
+		// TODO("Reimplement this once we are in a better place for it")
+		// for (FunctionHeader candidate : candidateFunctions)
+		//   explanation.append(candidate.explainWhyIncompatible(scope, arguments)).append("\n");
 		return new CompileError(CompileExceptionCode.CALL_NO_VALID_METHOD, message.toString());
 	}
 

CodeModel/src/main/java/org/openzen/zenscript/codemodel/compilation/MatchedCallArguments.java

@@ -42,9 +42,9 @@ public static <T extends AnyMethod> MatchedCallArguments<T> match(
 			}
 		}
 
-		return new MatchedCallArguments<>(CompileErrors.noMethodMatched(overloads.stream()
-				.map(AnyMethod::getHeader)
-				.collect(Collectors.toList())));
+		List<FunctionHeader> headers = overloads.stream().map(AnyMethod::getHeader).collect(Collectors.toList());
+		List<TypeID> types = Arrays.stream(arguments).map(CompilingExpression::eval).map(it -> it.type).collect(Collectors.toList());
+		return new MatchedCallArguments<>(CompileErrors.noMethodMatched(headers, types));
 	}
 
 	private static <T extends AnyMethod> MatchedCallArguments<T> ambiguousCall(Map<CastedExpression.Level, List<MatchedCallArguments<T>>> methodsGroupedByMatchLevel) {