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Summary: In some modules we directly dump the debugging output to STDOUT via 'putLogMsg', 'printInfoForUser' etc. However, if `-ddump-to-file` is enabled, that output should be written to a file. Easily fixed. Certain tests (T3017, Roles3, T12763 etc.) expect part of the output generated by `-ddump-types` to be in 'PprUser' style. However, generally we want all other debugging output to use 'PprDump' style. `traceTcRn` and `traceTcRnForUser` help us accomplish this. This patch also documents some missing flags in the users guide. Reviewers: RyanGlScott, bgamari, hvr Reviewed By: RyanGlScott Subscribers: rwbarton, carter GHC Trac Issues: #15953 Differential Revision: https://phabricator.haskell.org/D5382
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