reader-scratch.md

+Examples of valid and invalid uses of `/`.
+
+```javascript
+var i = 0;
+function f() {};
+
+// Function Declarations
+f(); function foo() {} /42/i
+/*
+/42/i
+*/
+{false} function foo() {} /42/i
+/*
+/42/i
+*/
+if (false) false
+function foo() {} /42/i
+/*
+/42/i
+*/
+i = 0;function foo() {} /42/i
+/*
+/42/i
+*/
+if (false) {} function foo() {} /42/i
+/*
+/42/i
+*/
+function foo() {} function foo() {} /42/i
+/*
+/42/i
+*/
+if (false) function foo() {} /42/i
+/*
+/42/i
+*/
+{function foo() {} /42/i}
+/*
+/42/i
+*/
+foo
+function foo() {} /42/i
+/*
+/42/i
+*/
+42
+function foo() {} /42/i
+/*
+/42/i
+*/
+[2,3]
+function foo() {} /42/i
+/*
+/42/i
+*/
+{a: 2}
+function foo() {} /42/i
+/*
+/42/i
+*/
+"foo"
+function foo() {} /42/i
+/*
+/42/i
+*/
+/42/i
+function foo() {} /42/i
+/*
+/42/i
+*/
+for (;;) {
+    break
+    function foo() {} /42/i
+}
+/*
+undefined
+*/
+
+debugger
+function foo() {} /42/i
+/*
+/42/i
+*/
+
+switch ("foo") {
+    case "foo": {true;}
+    case function foo() {} /42/i: {true;}
+}
+/*
+undefined
+*/
+if(false)
+false
+else
+function foo() {} /42/i
+/*
+/42/i
+*/
+[42][0]
+function foo() {} /42/i
+/*
+/42/i
+*/
+
+
+
+// Function Expressions
+x = function foo() {} /42/i
+/*
+NaN
+*/
+x = 42 / function foo() {} /42/i
+/*
+NaN
+*/
+42 >> function foo() {} /42/i
+/*
+42
+*/
+i = 0;+function foo() {} /42/i
+/*
+NaN
+*/
+(function foo() {} /42/i)
+/*
+NaN
+*/
+foo /
+function foo() {} /42/i
+/*
+NaN
+*/
+new function foo() {} /42/i
+/*
+NaN
+*/
+typeof function foo() {} /42/i
+/*
+NaN
+*/
+2 in function foo() {} /42/i
+/*
+Exception: invalid 'in' operand NaN
+@Scratchpad:1
+*/
+(function foo() {
+   return function foo() {} /42/i
+})()
+/*
+NaN
+*/
+do function foo() {} /42/ while (false);
+/*
+Exception: missing while after do-loop body
+Scratchpad:1
+*/
+void function foo() {} /42/i
+/*
+NaN
+*/
+[function foo() {} /42/i]
+/*
+NaN
+*/
+4,
+function foo() {} /42/i
+/*
+NaN
+*/
+++function foo() {} /42/i
+/*
+Exception: invalid increment operand
+Scratchpad:1
+*/
+
+x /= function foo() {} /42/i
+/*
+NaN
+*/
+
+
+// parse errors
+if (false) false function foo() {} /42/i
+/*
+Exception: missing ; before statement
+Scratchpad:1
+*/
+```
\ No newline at end of file