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Minor update to macros.

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Eric Huss 2021-06-15 14:44:59 -07:00
parent 105a9433b9
commit 93f9325701
1 changed files with 3 additions and 2 deletions
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src/macros.md
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@ -7,7 +7,8 @@ syntax: `some_extension!(...)`.
There are two ways to define new macros: There are two ways to define new macros:
* [Macros by Example] define new syntax in a higher-level, declarative way. * [Macros by Example] define new syntax in a higher-level, declarative way.
* [Procedural Macros] can be used to implement custom derive. * [Procedural Macros] define function-like macros, custom derives, and custom
attributes using functions that operate on input tokens.
## Macro Invocation ## Macro Invocation
@ -28,7 +29,7 @@ There are two ways to define new macros:
> &nbsp;&nbsp; | [_SimplePath_] `!` `[` _TokenTree_<sup>\*</sup> `]` `;`\ > &nbsp;&nbsp; | [_SimplePath_] `!` `[` _TokenTree_<sup>\*</sup> `]` `;`\
> &nbsp;&nbsp; | [_SimplePath_] `!` `{` _TokenTree_<sup>\*</sup> `}` > &nbsp;&nbsp; | [_SimplePath_] `!` `{` _TokenTree_<sup>\*</sup> `}`
A macro invocation executes a macro at compile time and replaces the A macro invocation expands a macro at compile time and replaces the
invocation with the result of the macro. Macros may be invoked in the invocation with the result of the macro. Macros may be invoked in the
following situations: following situations: