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| author | Björn Gustavsson <[email protected]> | 2013-01-23 11:41:28 +0100 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2013-01-23 11:41:28 +0100 |
| commit | 73fb496d2f072ab5b026d71faec3cc2b8907a268 (patch) | |
| tree | 52a4e8adc293972d686807b6b041a711a183ae22 /lib/kernel/doc/src | |
| parent | 744228a03cde1a45e905d563da2546419926c7ee (diff) | |
| download | otp-73fb496d2f072ab5b026d71faec3cc2b8907a268.tar.gz otp-73fb496d2f072ab5b026d71faec3cc2b8907a268.tar.bz2 otp-73fb496d2f072ab5b026d71faec3cc2b8907a268.zip | |
Add a warning to discourage abuse of $handle_undefined_function/2
Diffstat (limited to 'lib/kernel/doc/src')
| -rw-r--r-- | lib/kernel/doc/src/error_handler.xml | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/lib/kernel/doc/src/error_handler.xml b/lib/kernel/doc/src/error_handler.xml index 610b65f0a2..769a869ffa 100644 --- a/lib/kernel/doc/src/error_handler.xml +++ b/lib/kernel/doc/src/error_handler.xml @@ -62,6 +62,19 @@ <c>'$handle_undefined_function'(</c><anno>Function</anno>, <anno>Args</anno>). </p> + <warning> + <p>Defining <c>'$handle_undefined_function'/2</c> in + ordinary application code is highly discouraged. It is very + easy to make subtle errors that can take a long time to + debug. Furthermore, none of the tools for static code + analysis (such as Dialyzer and Xref) supports the use of + <c>'$handle_undefined_function'/2</c> and no such support + will be added. Only use this function after having carefully + considered other, less dangerous, solutions. One example of + potential legitimate use is creating stubs for other + sub-systems during testing and debugging. + </p> + </warning> <p>Otherwise an <c>undef</c> exception will be raised.</p> </desc> </func> |