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Fix expression and statement grammar. #776

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Mar 7, 2020
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Fix expression and statement grammar. #776

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3 changes: 0 additions & 3 deletions src/expressions/block-expr.md
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Expand Up @@ -28,9 +28,6 @@ a following semicolon except if its outer expression is a flow control
expression. Furthermore, extra semicolons between statements are allowed, but
these semicolons do not affect semantics.

> Note: The semicolon following a statement is not a part of the statement
> itself. They are invalid when using the `stmt` macro matcher.

When evaluating a block expression, each statement, except for item declaration
statements, is executed sequentially. Then the final expression is executed,
if given.
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7 changes: 3 additions & 4 deletions src/expressions/match-expr.md
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Expand Up @@ -9,10 +9,10 @@
>
> _MatchArms_ :\
>    ( _MatchArm_ `=>`
> ( [_BlockExpression_] `,`<sup>?</sup>
> | [_Expression_] `,` )
> ( [_ExpressionWithoutBlock_][_Expression_] `,`
> | [_ExpressionWithBlock_][_Expression_] `,`<sup>?</sup> )
> )<sup>\*</sup>\
> &nbsp;&nbsp; _MatchArm_ `=>` ( [_BlockExpression_] | [_Expression_] ) `,`<sup>?</sup>
> &nbsp;&nbsp; _MatchArm_ `=>` [_Expression_] `,`<sup>?</sup>
>
> _MatchArm_ :\
> &nbsp;&nbsp; [_OuterAttribute_]<sup>\*</sup> _MatchArmPatterns_ _MatchArmGuard_<sup>?</sup>
Expand Down Expand Up @@ -146,7 +146,6 @@ expression in the same expression contexts as [attributes on block
expressions].

[_Expression_]: ../expressions.md
[_BlockExpression_]: block-expr.md#block-expressions
[place expression]: ../expressions.md#place-expressions-and-value-expressions
[value expression]: ../expressions.md#place-expressions-and-value-expressions
[_InnerAttribute_]: ../attributes.md
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2 changes: 1 addition & 1 deletion src/statements.md
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Expand Up @@ -69,7 +69,7 @@ from the point of declaration until the end of the enclosing block scope.
> **<sup>Syntax</sup>**\
> _ExpressionStatement_ :\
> &nbsp;&nbsp; &nbsp;&nbsp; [_ExpressionWithoutBlock_][expression] `;`\
> &nbsp;&nbsp; | [_ExpressionWithBlock_][expression]
> &nbsp;&nbsp; | [_ExpressionWithBlock_][expression] `;`<sup>?</sup>

An *expression statement* is one that evaluates an [expression] and ignores its
result. As a rule, an expression statement's purpose is to trigger the effects
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