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Update syntax-if-statements-initializers.md

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docs/syntax-if-statements-initializers.md
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@ -52,7 +52,24 @@ end
# Design
If statements with initializers must match (following the Luau grammar) `'if' 'local' bindinglist ['=' explist] 'then'` and `'local' bindinglist ['=' explist] where exp 'then'` syntax. The variables declared by an initializer are only available to the if statement's blocks; any code after the if statement won't have the variables defined.
If statements with initializers must match the below grammar. The variables declared by an initializer are only available to the if statement's blocks; any code after the if statement won't have the variables defined.
```diff
stat = varlist '=' explist |
...
'repeat' block 'until' exp |
- 'if' exp 'then' block {'elseif' exp 'then' block} ['else' block] 'end' |
+ 'if' cond 'then' block {'elseif' cond 'then' block} ['else' block] 'end' |
'for' binding '=' exp ',' exp [',' exp] 'do' block 'end' |
...
- ifelseexp = 'if' exp 'then' exp {'elseif' exp 'then' exp} 'else' exp
+ ifelseexp = 'if' cond 'then' exp {'elseif' cond 'then' exp} 'else' exp
+ cond = 'local' binding '=' exp ['where' exp] |
+ 'local' bindinglist '=' explist 'where' exp |
+ exp
```
In the former case, the value of the first declared variable will be checked.