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diff --git a/doc/bugs/Build_error_with_Yesod_1.4.mdwn b/doc/bugs/Build_error_with_Yesod_1.4.mdwn
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+++ b/doc/bugs/Build_error_with_Yesod_1.4.mdwn
@@ -0,0 +1,284 @@
+### Please describe the problem.
+I have problems building with yesod 1.4
+
+### What steps will reproduce the problem?
+Building git annex in a clean sandbox. 
+
+### What version of git-annex are you using? On what operating system?
+5.20140927 on OS X i.e. Trying to upgrade the homebrew recipe to the most recent version of git-annex
+
+### Please provide any additional information below.
+Error messages below are discussed in the following SO-thread:
+https://stackoverflow.com/questions/26225991/illegal-view-pattern-frompathpiece-just-dyn-abdd-when-using-parameters-on
+
+
+[[!format sh """
+# If you can, paste a complete transcript of the problem occurring here.
+# If the problem is with the git-annex assistant, paste in .git/annex/daemon.log
+[310 of 470] Compiling Assistant.WebApp.Types ( Assistant/WebApp/Types.hs, dist/dist-sandbox-52ca649e/build/git-annex/git-annex-tmp/Assistant/WebApp/Types.o )
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_aceZO
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_aceZW
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf02
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0c
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0e
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0f
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0h
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0j
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0l
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0n
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0p
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0r
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0u
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0w
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0y
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0z
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0C
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0D
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0F
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0H
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0J
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0L
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0M
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0O
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0R
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0T
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf0U
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf11
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf13
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf18
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1a
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1c
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1e
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1g
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1i
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1k
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1m
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1o
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1q
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1s
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1v
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1x
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1z
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1B
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1D
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1G
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1I
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1J
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1L
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1M
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1O
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1R
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1U
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1X
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf1Y
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf20
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf22
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf25
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf27
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf28
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf2b
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf2d
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf2f
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf2h
+    Use ViewPatterns to enable view patterns
+
+Assistant/WebApp/Types.hs:40:1:
+    Illegal view pattern:  fromPathPiece -> Just dyn_acf2j
+    Use ViewPatterns to enable view patterns
+cabal: Error: some packages failed to install:
+git-annex-5.20140927
+
+
+# End of transcript or log.
+"""]]