mailrank/aeson — pull request #32 by roelvandijk (2011-10-11 14:18:53+00:00)
Title: Better parse fail messages for TH derived FromJSON instances

In the discussion about issue #30 the need for better error messages when parsing failed came up. This patch adds those messages.

When parsing fails you will get a detailed error message telling you as precise as possible what went wrong.

The performance of parsing should not be affected.