Diffusion Ant (feature/nursery) Code

ant/examples/spec/exceptions.js
ddfe6237cab5feature/nursery

exceptions.js
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			import { test, testDeep, summary } from './helpers.js';

			console.log('Exception Tests\n');

			let result1 = 'not caught';
			try {
			throw new Error('test error');
			result1 = 'should not reach';
			} catch (e) {
			result1 = 'caught: ' + e.message;
			}
			test('basic try-catch', result1, 'caught: test error');

			let result2 = 'initial';
			try {
			result2 = 'no error';
			} catch (e) {
			result2 = 'caught';
			}
			test('try without exception', result2, 'no error');

			let result3 = [];
			try {
			result3.push('try');
			throw new Error('error');
			} catch (e) {
			result3.push('catch');
			} finally {
			result3.push('finally');
			}
			testDeep('try-catch-finally', result3, ['try', 'catch', 'finally']);

			let result4 = [];
			try {
			result4.push('try');
			} finally {
			result4.push('finally');
			}
			testDeep('try-finally no error', result4, ['try', 'finally']);

			let result5 = 'not caught';
			try {
			throw 'error string';
			} catch {
			result5 = 'caught without binding';
			}
			test('catch without binding', result5, 'caught without binding');

			let result6 = [];
			try {
			result6.push('outer try');
			try {
			result6.push('inner try');
			throw new Error('inner error');
			} catch (e) {
			result6.push('inner catch');
			}
			result6.push('after inner');
			} catch (e) {
			result6.push('outer catch');
			}
			testDeep('nested try-catch', result6, ['outer try', 'inner try', 'inner catch', 'after inner']);

			let result7 = [];
			try {
			try {
			throw new Error('original');
			} catch (e) {
			result7.push('first catch');
			throw new Error('rethrown');
			}
			} catch (e) {
			result7.push('second catch: ' + e.message);
			}
			testDeep('rethrow', result7, ['first catch', 'second catch: rethrown']);

			function testFinallyReturn() {
			let x = [];
			try {
			x.push('try');
			return x;
			} finally {
			x.push('finally');
			}
			}
			testDeep('finally with return', testFinallyReturn(), ['try', 'finally']);

			try {
			throw new Error('test message');
			} catch (e) {
			test('error name', e.name, 'Error');
			test('error message', e.message, 'test message');
			}

			class CustomError extends Error {
			constructor(msg) {
			super(msg);
			this.name = 'CustomError';
			}
			}

			try {
			throw new CustomError('custom message');
			} catch (e) {
			test('custom error name', e.name, 'CustomError');
			test('custom error message', e.message, 'custom message');
			}

			let counter = 0;
			try {
			counter = 1;
			throw new Error('test');
			} catch (e) {
			counter = 2;
			} finally {
			counter = counter + 10;
			}
			test('finally modifies value', counter, 12);

			summary();

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