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format: Clarify what nil represents #170

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Feb 27, 2023
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format: Clarify what nil represents #170

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6 changes: 4 additions & 2 deletions design/mvp/WIT.md
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Original file line number Diff line number Diff line change
Expand Up @@ -683,6 +683,8 @@ sequence of items and functions.

Specifically interfaces have the structure:

> **Note**: The symbol `ε`, also known as Epsilon, denotes an empty string.

```ebnf
interface-item ::= 'default'? 'interface' id '{' interface-items* '}'

Expand All @@ -704,11 +706,11 @@ func-type ::= 'func' param-list result-list

param-list ::= '(' named-type-list ')'

result-list ::= nil
result-list ::= ϵ
| '->' ty
| '->' '(' named-type-list ')'

named-type-list ::= nil
named-type-list ::= ϵ
| named-type ( ',' named-type )*

named-type ::= id ':' ty
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