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Configuring OneTuple-0.2.1...
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Configuring clock-0.7.2...
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Configuring colour-2.3.4...
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Configuring void-0.7.2...
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Configuring intervals-0.8.1...
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Installed diagrams-core-1.4.0.1
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Building diagrams-lib-1.4.2...
Installed diagrams-lib-1.4.2
Configuring diagrams-svg-1.4.1.1...
Configuring SVGFonts-1.6.0.3...
Building SVGFonts-1.6.0.3...
Building diagrams-svg-1.4.1.1...
Installed SVGFonts-1.6.0.3
Installed diagrams-svg-1.4.1.1
Configuring chart-unit-0.6.0.0...
Building chart-unit-0.6.0.0...
Failed to install chart-unit-0.6.0.0
Build log ( /home/builder/.cabal/logs/ghc-8.2.2/chart-unit-0.6.0.0-Epp93E4I6mMEwqot2EDUO6.log ):
cabal: Entering directory '/tmp/cabal-tmp-9498/chart-unit-0.6.0.0'
Configuring chart-unit-0.6.0.0...
Preprocessing library for chart-unit-0.6.0.0..
Building library for chart-unit-0.6.0.0..
[ 1 of 14] Compiling Chart.Core       ( src/Chart/Core.hs, dist/build/Chart/Core.o )
[ 2 of 14] Compiling Chart.Arrow      ( src/Chart/Arrow.hs, dist/build/Chart/Arrow.o )
[ 3 of 14] Compiling Chart.Data       ( src/Chart/Data.hs, dist/build/Chart/Data.o )
[ 4 of 14] Compiling Chart.Data.Time  ( src/Chart/Data/Time.hs, dist/build/Chart/Data/Time.o )
[ 5 of 14] Compiling Chart.Rect       ( src/Chart/Rect.hs, dist/build/Chart/Rect.o )
[ 6 of 14] Compiling Chart.Svg        ( src/Chart/Svg.hs, dist/build/Chart/Svg.o )
[ 7 of 14] Compiling Chart.Text       ( src/Chart/Text.hs, dist/build/Chart/Text.o )
[ 8 of 14] Compiling Chart.Glyph      ( src/Chart/Glyph.hs, dist/build/Chart/Glyph.o )
[ 9 of 14] Compiling Chart.Line       ( src/Chart/Line.hs, dist/build/Chart/Line.o )
[10 of 14] Compiling Chart.Hud        ( src/Chart/Hud.hs, dist/build/Chart/Hud.o )
[11 of 14] Compiling Chart.Bar        ( src/Chart/Bar.hs, dist/build/Chart/Bar.o )
[12 of 14] Compiling Chart.ADT        ( src/Chart/ADT.hs, dist/build/Chart/ADT.o )
[13 of 14] Compiling Chart            ( src/Chart.hs, dist/build/Chart.o )
[14 of 14] Compiling Paths_chart_unit ( dist/build/autogen/Paths_chart_unit.hs, dist/build/Paths_chart_unit.o )
Preprocessing executable 'chart-unit-gallery' for chart-unit-0.6.0.0..
Building executable 'chart-unit-gallery' for chart-unit-0.6.0.0..
[1 of 2] Compiling Main             ( examples/gallery.hs, dist/build/chart-unit-gallery/chart-unit-gallery-tmp/Main.o )

examples/gallery.hs:34:23: error:
    Variable not in scope: standard :: Prob IO Double
   |
34 | rvs gen n = samples n standard gen
   |                       ^^^^^^^^
cabal: Leaving directory '/tmp/cabal-tmp-9498/chart-unit-0.6.0.0'
cabal: Error: some packages failed to install:
chart-unit-0.6.0.0-Epp93E4I6mMEwqot2EDUO6 failed during the building phase.
The exception was:
ExitFailure 1