This proposal makes it easier to write functional code, you can convert
statements block into expressions producing a useful result and plugging
that back into an expression context.
This proposal is an alternative to the 'do expressions'.
Prepending `=` will automatically convert `if...else`, `switch...`, `block`
into statement that returns last inner statements value by default.
examples:
```
// the following 3 lines are equivalent
console.log(=if (expr) {a} else {b})
console.log(=if (expr) a else b)
console.log(expr ? a : b)
// print the value of statement3
console.log(={
statement1
statement2
statement3
})
```
If the left hand side is an expression or operator, '=' can be omitted
```
LeftHandSideExpression = if (condition)
statement1
[else
statement2]
let someVal = LeftHandSideExpression * if (condition)
statement1
[else
statement2]
```
examples:
```
// the following 3 examples are equivalent
let x = if (expr) {a} else {b}
let x = if (expr) a else b
let x = expr ? a : b
let x = {
// statements here
console.log('print unicorn')
y // will assign y to x
}
```
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