compiler, runtime: Refactor Errors

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>

Tests/p4rseTests/ExpressionTests/FunctionCall.swift

@@ -182,5 +182,5 @@ import TreeSitterP4
 
   let error = try #UseErrorResult(Program.Compile(simple_parser_declaration))
 
-  #expect(error.msg.contains("{29, 12}: Type of expression in return statement (Boolean) is not compatible with function return type (Int)"))
+  #expect(error.msg().contains("{29, 12}: Type of expression in return statement (Boolean) is not compatible with function return type (Int)"))
 }

Tests/p4rseTests/ParserCompilerTests.swift

@@ -75,8 +75,8 @@ import P4Lang
 
   let compilation_error = try #UseErrorResult(Program.Compile(simple_parser_declaration))
 
-  #expect(compilation_error.msg.contains("asde"))
-  #expect(compilation_error.msg.contains("asdf"))
+  #expect(compilation_error.msg().contains("asde"))
+  #expect(compilation_error.msg().contains("asdf"))
 }
 
 @Test func test_simple_compiler_macro_nodetype_test() async throws {
@@ -96,7 +96,7 @@ import P4Lang
 
   #expect(
     #RequireErrorResult<(EvaluatableStatement, CompilerContext)>(
-      Error(withMessage: "{2, 154}: Did not find assignment statement"),
+      ErrorWithLocation(sourceLocation: SourceLocation(2, 154), withError: "Did not find assignment statement"),
       ParserAssignmentStatement.Compile( // Note: Calling ParserAssignmentStatement compilation directly.
         node: result.rootNode!, withContext: CompilerContext())))
 }

Tests/p4rseTests/ValueTypeParserTests.swift

@@ -42,7 +42,7 @@ import TreeSitterP4
     guard case Result.Error(let e) = err else {
       assert(false, "Expected an error, but had success")
     }
-    #expect(e.msg.contains("Failed to parse a statement element: Could not parse a P4 type from \(invalid_type_name)"))
+    #expect(e.format().contains("Failed to parse a statement element: Could not parse a P4 type from \(invalid_type_name)"))
   }
 }