Add wrenAbortFiber().

Thanks, @underscorediscovery!

test/api/error.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <string.h>
+
+#include "error.h"
+
+static void runtimeError(WrenVM* vm)
+{
+  wrenEnsureSlots(vm, 1);
+  wrenSetSlotString(vm, 0, "Error!");
+  wrenAbortFiber(vm, 0);
+}
+
+WrenForeignMethodFn errorBindMethod(const char* signature)
+{
+  if (strcmp(signature, "static Error.runtimeError") == 0) return runtimeError;
+
+  return NULL;
+}

test/api/error.h

@@ -0,0 +1,3 @@
+#include "wren.h"
+
+WrenForeignMethodFn errorBindMethod(const char* signature);

test/api/error.wren

@@ -0,0 +1,12 @@
+class Error {
+  foreign static runtimeError
+}
+
+var fiber = Fiber.new {
+  Error.runtimeError
+}
+
+var error = fiber.try()
+System.print(error) // expect: Error!
+System.print(fiber.isDone) // expect: true
+System.print(fiber.error) // expect: Error!

test/api/main.c

@@ -6,6 +6,7 @@
 
 #include "benchmark.h"
 #include "call.h"
+#include "error.h"
 #include "get_variable.h"
 #include "foreign_class.h"
 #include "handle.h"
@@ -35,6 +36,9 @@ static WrenForeignMethodFn bindForeignMethod(
   
   method = benchmarkBindMethod(fullName);
   if (method != NULL) return method;
+  
+  method = errorBindMethod(fullName);
+  if (method != NULL) return method;
 
   method = getVariableBindMethod(fullName);
   if (method != NULL) return method;