js-on-sx: baseline commit (278/280 unit, 148/148 slice, runner stub)

Initial commit of the lib/js/ tree and plans/ directory. A previous
session left template-string work in progress — 278/280 unit tests pass
(2 failing: tpl part-count off-by-one, escaped-backtick ident lookup).
test262-runner.py and scoreboard are placeholders (0/8 with 7 timeouts);
fixing the runner is the next queue item.

lib/js/test262-slice/async/async_arrow.expected

@@ -0,0 +1 @@
+42

lib/js/test262-slice/async/async_arrow.js

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+var double = async x => x * 2;
+var r = null;
+double(21).then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/async_arrow_multiparam.expected

@@ -0,0 +1 @@
+42

lib/js/test262-slice/async/async_arrow_multiparam.js

@@ -0,0 +1,5 @@
+var add = async (a, b) => a + b;
+var r = null;
+add(10, 32).then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/async_fn_basic.expected

@@ -0,0 +1 @@
+42

lib/js/test262-slice/async/async_fn_basic.js

@@ -0,0 +1,5 @@
+async function f() { return 42; }
+var r = null;
+f().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/async_fn_throws.expected

@@ -0,0 +1 @@
+nope

lib/js/test262-slice/async/async_fn_throws.js

@@ -0,0 +1,5 @@
+async function f() { throw "nope"; }
+var r = null;
+f().catch(e => { r = e; });
+__drain();
+r

lib/js/test262-slice/async/async_nested_calls.expected

@@ -0,0 +1 @@
+33

lib/js/test262-slice/async/async_nested_calls.js

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+async function inner(x) { return x * 2; }
+async function middle(x) { var r = await inner(x); return r + 1; }
+async function outer(x) { var r = await middle(x); return r * 3; }
+var result = null;
+outer(5).then(v => { result = v; });
+__drain();
+result

lib/js/test262-slice/async/async_returns_promise.expected

@@ -0,0 +1 @@
+100

lib/js/test262-slice/async/async_returns_promise.js

@@ -0,0 +1,5 @@
+async function wrap(x) { return Promise.resolve(x); }
+var r = null;
+wrap(100).then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_basic.expected

@@ -0,0 +1 @@
+70

lib/js/test262-slice/async/await_basic.js

@@ -0,0 +1,9 @@
+async function add(a, b) { return a + b; }
+async function main() {
+  var r = await add(3, 4);
+  return r * 10;
+}
+var result = null;
+main().then(v => { result = v; });
+__drain();
+result

lib/js/test262-slice/async/await_chain.expected

@@ -0,0 +1 @@
+3

lib/js/test262-slice/async/await_chain.js

@@ -0,0 +1,11 @@
+async function step() { return 1; }
+async function main() {
+  var a = await step();
+  var b = await step();
+  var c = await step();
+  return a + b + c;
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_in_loop.expected

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+5

lib/js/test262-slice/async/await_in_loop.js

@@ -0,0 +1,12 @@
+async function one() { return 1; }
+async function main() {
+  var sum = 0;
+  for (var i = 0; i < 5; i = i + 1) {
+    sum = sum + await one();
+  }
+  return sum;
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_nonpromise.expected

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+43

lib/js/test262-slice/async/await_nonpromise.js

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+async function main() {
+  var x = await 42;
+  return x + 1;
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_promise_all.expected

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+6

lib/js/test262-slice/async/await_promise_all.js

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+async function main() {
+  var vs = await Promise.all([Promise.resolve(1), Promise.resolve(2), Promise.resolve(3)]);
+  return vs[0] + vs[1] + vs[2];
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_rejected.expected

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+caught:no

lib/js/test262-slice/async/await_rejected.js

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+async function bad() { throw "no"; }
+async function main() {
+  try { await bad(); return "unreachable"; }
+  catch (e) { return "caught:" + e; }
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r

lib/js/test262-slice/async/await_throws_error_object.expected

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+bad

lib/js/test262-slice/async/await_throws_error_object.js

@@ -0,0 +1,9 @@
+async function failing() { throw new Error("bad"); }
+async function main() {
+  try { await failing(); return "unreachable"; }
+  catch (e) { return e.message; }
+}
+var r = null;
+main().then(v => { r = v; });
+__drain();
+r