6 files changed, 8 insertions, 8 deletions
diff --git a/tests/Tests/Writers/AsciiDoc.hs b/tests/Tests/Writers/AsciiDoc.hs
index 1b0a8de66..0062667cf 100644
--- a/tests/Tests/Writers/AsciiDoc.hs
+++ b/tests/Tests/Writers/AsciiDoc.hs
@@ -6,7 +6,7 @@ import Text.Pandoc
 import Tests.Helpers
 import Tests.Arbitrary()
 
-asciidoc :: (ToString a, ToPandoc a) => a -> String
+asciidoc :: (ToPandoc a) => a -> String
 asciidoc = writeAsciiDoc def{ writerWrapText = WrapNone } . toPandoc
 
 tests :: [Test]
diff --git a/tests/Tests/Writers/ConTeXt.hs b/tests/Tests/Writers/ConTeXt.hs
index d44b15658..5098a5fee 100644
--- a/tests/Tests/Writers/ConTeXt.hs
+++ b/tests/Tests/Writers/ConTeXt.hs
@@ -7,10 +7,10 @@ import Text.Pandoc
 import Tests.Helpers
 import Tests.Arbitrary()
 
-context :: (ToString a, ToPandoc a) => a -> String
+context :: (ToPandoc a) => a -> String
 context = writeConTeXt def . toPandoc
 
-context' :: (ToString a, ToPandoc a) => a -> String
+context' :: (ToPandoc a) => a -> String
 context' = writeConTeXt def{ writerWrapText = WrapNone } . toPandoc
 
 {-
diff --git a/tests/Tests/Writers/Docbook.hs b/tests/Tests/Writers/Docbook.hs
index b1ac35980..2c0ff6179 100644
--- a/tests/Tests/Writers/Docbook.hs
+++ b/tests/Tests/Writers/Docbook.hs
@@ -7,7 +7,7 @@ import Text.Pandoc
 import Tests.Helpers
 import Tests.Arbitrary()
 
-docbook :: (ToString a, ToPandoc a) => a -> String
+docbook :: (ToPandoc a) => a -> String
 docbook = writeDocbook def{ writerWrapText = WrapNone } . toPandoc
 
 {-
diff --git a/tests/Tests/Writers/HTML.hs b/tests/Tests/Writers/HTML.hs
index 53ed95fc7..9b612e446 100644
--- a/tests/Tests/Writers/HTML.hs
+++ b/tests/Tests/Writers/HTML.hs
@@ -7,7 +7,7 @@ import Text.Pandoc
 import Tests.Helpers
 import Tests.Arbitrary()
 
-html :: (ToString a, ToPandoc a) => a -> String
+html :: (ToPandoc a) => a -> String
 html = writeHtmlString def{ writerWrapText = WrapNone } . toPandoc
 
 {-
diff --git a/tests/Tests/Writers/LaTeX.hs b/tests/Tests/Writers/LaTeX.hs
index 05dfcbd3d..4a1232db2 100644
--- a/tests/Tests/Writers/LaTeX.hs
+++ b/tests/Tests/Writers/LaTeX.hs
@@ -7,10 +7,10 @@ import Text.Pandoc
 import Tests.Helpers
 import Tests.Arbitrary()
 
-latex :: (ToString a, ToPandoc a) => a -> String
+latex :: (ToPandoc a) => a -> String
 latex = writeLaTeX def{ writerHighlight = True } . toPandoc
 
-latexListing :: (ToString a, ToPandoc a) => a -> String
+latexListing :: (ToPandoc a) => a -> String
 latexListing = writeLaTeX def{ writerListings = True } . toPandoc
 
 {-
diff --git a/tests/Tests/Writers/Markdown.hs b/tests/Tests/Writers/Markdown.hs
index 8ffd7a8c0..1c27ebdf4 100644
--- a/tests/Tests/Writers/Markdown.hs
+++ b/tests/Tests/Writers/Markdown.hs
@@ -8,7 +8,7 @@ import Text.Pandoc
 import Tests.Helpers
 import Tests.Arbitrary()
 
-markdown :: (ToString a, ToPandoc a) => a -> String
+markdown :: (ToPandoc a) => a -> String
 markdown = writeMarkdown def . toPandoc
 
 {-