Move BindingPattern restriction for 'using' to an early error #145
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A preview of this PR can be found at https://tc39.es/proposal-explicit-resource-management/pr/145. |
rbuckton
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Jan 30, 2023
spec.emu
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| <emu-grammar>ForBinding : BindingPattern</emu-grammar> | ||
| <ul> | ||
| <li> | ||
| It is a Syntax Error if this |ForBinding| is contained in a |ForDeclaration| and IsUsingDeclaration of that |ForDeclaration| is *true*. |
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@michaelficarra: Is this sufficient to cover the case of a ForBinding contained in a `for` `(` `var` ForBinding ... production?
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Yeah that seems to work.
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Per editor feedback in tc39/proposal-async-explicit-resource-management#9, this moves the BindingPattern restriction for
usingdeclarations to an Early Error to avoid ambiguity from using theUsingparameter in two different ways. The early error condition is roughly equivalent to howconstdeclarations report an early error on a missing Initializer.