Index: tests/except-0.c
===================================================================
--- tests/except-0.c	(revision 90152a4860529aff7214be01cd22abd37012cd19)
+++ tests/except-0.c	(revision 90152a4860529aff7214be01cd22abd37012cd19)
@@ -0,0 +1,247 @@
+// Draft of tests for exception handling.
+// Outdated: The integer constant exceptions need to be replaced with virtual
+// exceptions for the new system.
+
+// ERROR: exceptions do not interact with ^?{} properly.
+
+#include <stdio.h>
+#include <stdbool.h>
+
+#include "except-mac.h"
+TRIVIAL_EXCEPTION(yin)
+TRIVIAL_EXCEPTION(yang)
+TRIVIAL_EXCEPTION(zen)
+
+
+// Local type to mark exits from scopes. (see ERROR)
+struct signal_exit {
+	const char * area;
+};
+
+void ?{}(signal_exit * this, const char * area) {
+	this->area = area;
+}
+
+void ^?{}(signal_exit * this) {
+	printf("Exiting: %s\n", this->area);
+//	sout | "Exiting:" | this->area | endl;
+}
+
+
+// Mark throws: make sure to only pass in exception types.
+forall(dtype T)
+void terminate(T * except_value) {
+	signal_exit a = {"terminate function"};
+	THROW(except_value);
+	printf("terminate returned\n");
+}
+
+forall(dtype T)
+void resume(T * except_value) {
+	signal_exit a = {"resume function"};
+	THROW_RESUME(except_value);
+	printf("resume returned\n");
+}
+
+// Termination Test: Two handlers: no catch, catch
+void bar() {
+	signal_exit a = {"bar function"};
+	try {
+		terminate(&(zen){});
+	} catch (yin * error) {
+		printf("bar caught exception yin.\n");
+	}
+}
+
+void foo() {
+	signal_exit a = {"foo function"};
+	try {
+		bar();
+	} catch (yang * error) {
+		printf("foo caught exception yang.\n");
+	} catch (zen * error) {
+		printf("foo caught exception zen.\n");
+	}
+}
+
+// Resumption Two Handler Test: no catch, catch.
+void beta() {
+	signal_exit a = {"beta function"};
+	try {
+		zen x;
+		resume(&x);
+	} catchResume (yin * error) {
+		printf("beta caught exception yin\n");
+	}
+}
+
+void alpha() {
+	signal_exit a = {"alpha function"};
+	try {
+		beta();
+	} catchResume (yang * error) {
+		printf("alpha caught exception yang\n");
+	} catchResume (zen * error) {
+		printf("alpha caught exception zen\n");
+	}
+}
+
+// Finally Test:
+void farewell(bool jump) {
+	try {
+		if (jump) {
+			printf("jump out of farewell\n");
+			goto endoffunction;
+		} else {
+			printf("walk out of farewell\n");
+		}
+	} finally {
+		printf("See you next time\n");
+	}
+	endoffunction:
+	printf("leaving farewell\n");
+}
+
+// Resume-to-Terminate Test:
+void fallback() {
+	try {
+		zen x;
+		resume(&x);
+	} catch (zen * error) {
+		printf("fallback caught termination zen\n");
+	}
+}
+
+// Terminate Throw New Exception:
+void terminate_swap() {
+	signal_exit a = {"terminate_swap"};
+	try {
+		yin x;
+		terminate(&x);
+	} catch (yin * error) {
+		yang y;
+		terminate(&y);
+	}
+}
+
+void terminate_swapped() {
+	signal_exit a = {"terminate_swapped"};
+	try {
+		terminate_swap();
+	} catch (yang * error) {
+		printf("terminate_swapped caught exception yang\n");
+	}
+}
+
+// Resume Throw New Exception:
+void resume_swap() {
+	signal_exit a = {"resume_swap"};
+	try {
+		yin x;
+		resume(&x);
+	} catchResume (yin * error) {
+		yang y;
+		resume(&y);
+	}
+}
+
+void resume_swapped() {
+	try {
+		resume_swap();
+	} catchResume (yang * error) {
+		printf("resume_swapped caught exception yang\n");
+	}
+}
+
+// Terminate Rethrow:
+void reterminate() {
+	try {
+		try {
+			zen x;
+			terminate(&x);
+		} catch (zen * error) {
+			printf("reterminate zen caught and "
+			       "will rethrow exception zen\n");
+			throw;
+		}
+	} catch (zen * error) {
+		printf("reterminate 1 caught exception zen\n");
+	}
+}
+
+// Resume Rethrow:
+void reresume() {
+	try {
+		try {
+			zen x;
+			resume(&x);
+		} catchResume (zen * error) {
+			printf("reresume zen caught and rethrows exception zen\n");
+			throwResume;
+		}
+	} catchResume (zen * error) {
+		printf("reresume 1 caught exception zen\n");
+	}
+}
+
+// Terminate-Resume interaction:
+void fum() {
+	// terminate block, call resume
+	try {
+		zen x;
+		resume(&x);
+	} catch (zen * error) {
+		printf("fum caught exception zen\n");
+	}
+}
+
+void foe() {
+	// resume block, call terminate
+	try {
+		zen y;
+		terminate(&y);
+	} catchResume (zen * error) {
+		printf("foe caught exception zen\n");
+	}
+}
+
+void fy() {
+	// terminate block calls fum, call foe
+	try {
+		foe();
+	} catch (zen * error) {
+		printf("fy caught exception zen\n");
+		fum();
+	}
+}
+
+void fee() {
+	// resume block, call fy
+	try {
+		fy();
+	} catchResume (zen * error) {
+		printf("fee caught exception zen\n");
+	}
+}
+
+
+// main: choose which tests to run
+int main(int argc, char * argv[]) {
+	signal_exit a = {"main function"};
+
+	foo(); printf("\n");
+	alpha(); printf("\n");
+	farewell(false); printf("\n");
+	farewell(true); printf("\n");
+	fallback(); printf("\n");
+	terminate_swapped(); printf("\n");
+	resume_swapped(); printf("\n");
+	reterminate(); printf("\n");
+	reresume(); printf("\n");
+	fee(); printf("\n");
+
+	// Uncaught termination test.
+	printf("Throw uncaught.\n");
+	yang z;
+	terminate(&z);
+}