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Document trailing comma limitation #26

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Document trailing comma limitation #26

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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -58,4 +58,4 @@ Currently the format string supports the following special sequences:
```

### Limitations
There is no compile-time warning if the number of {}'s in the format string doesn't match the number of return values. You'll just get None for extra return values. See src/lib.rs for more details.
There is no compile-time warning if the number of {}'s in the format string doesn't match the number of return values. You'll just get None for extra return values. See src/lib.rs for more details. Also, a trailing comma at the end of the macro invocation is treated as an undeclared type.
6 changes: 4 additions & 2 deletions src/lib.rs
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Expand Up @@ -85,8 +85,10 @@
//!
//! ## LIMITATIONS:
//! There are no compile-time checks to make sure the format
//! strings matches the number of return arguments. Extra
//! return values will be None or cause a Result error.
//! strings matches the number of return arguments. Also, a
//! trailing comma at the end of the macro invocation is
//! treated as an undeclared type. Extra return values will
//! be None or cause a Result error.
//!
//! Like sscanf(), whitespace (including \n) is largely ignored.
//!
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