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Add support for Lambda discard parameters #995

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Add support for Lambda discard parameters #995

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2 changes: 2 additions & 0 deletions standard/expressions.md
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Expand Up @@ -4974,6 +4974,8 @@ The behavior of *lambda_expression*s and *anonymous_method_expression*s is the s

### 12.19.2 Anonymous function signatures

If an *explicit_anonymous_function_parameter_list* or an *implicit_anonymous_function_parameter_list* contains multiple *identifier*s `_`, each of those identifiers denotes a discard ([§9.2.9.1](variables.md#9291-discards)). Otherwise, any single *identifier* `_` denotes a parameter.

The *anonymous_function_signature* of an anonymous function defines the names and optionally the types of the formal parameters for the anonymous function. The scope of the parameters of the anonymous function is the *anonymous_function_body* ([§7.7](basic-concepts.md#77-scopes)). Together with the parameter list (if given) the anonymous-method-body constitutes a declaration space ([§7.3](basic-concepts.md#73-declarations)). It is thus a compile-time error for the name of a parameter of the anonymous function to match the name of a local variable, local constant or parameter whose scope includes the *anonymous_method_expression* or *lambda_expression*.

If an anonymous function has an *explicit_anonymous_function_signature*, then the set of compatible delegate types and expression tree types is restricted to those that have the same parameter types and modifiers in the same order ([§10.7](conversions.md#107-anonymous-function-conversions)). In contrast to method group conversions ([§10.8](conversions.md#108-method-group-conversions)), contra-variance of anonymous function parameter types is not supported. If an anonymous function does not have an *anonymous_function_signature*, then the set of compatible delegate types and expression tree types is restricted to those that have no out parameters.
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