Add example and doc for Arg (Fixes #17153)

36 jobs for master in 519 minutes and 47 seconds (queued for 4 seconds)
Status Job ID Name Coverage
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  Cleanup
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  Deploy
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Name Stage Failure
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nightly-x86_64-freebsd Full Build
WARNING: ghc-x86_64-portbld-freebsd.tar.xz: no matching files 
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nightly-x86_64-linux-deb9-llvm Full Build
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nightly-i386-windows-hadrian Full Build
Git branch:   12-9-stable
GO version: go1.13.8
Built: 2020-03-20T13:02:39+0000
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nightly-i386-windows Full Build
Git branch:   12-9-stable
GO version: go1.13.8
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validate-i386-windows Full Build
Git branch:   12-9-stable
GO version: go1.13.8
Built: 2020-03-20T13:02:39+0000
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nightly-x86_64-windows Full Build
Git branch:   12-9-stable
GO version: go1.13.8
Built: 2020-03-20T13:02:39+0000
OS/Arch: windows/amd64
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validate-x86_64-windows Full Build
GO version:   go1.13.4
Built: 2019-12-22T11:55:34+0000
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validate-aarch64-linux-deb9 Full Build
cd "libraries/unix/tests/resourceLimit.run" &&  "/builds/ghc/ghc/inplace/bin/ghc-stage2" -o resourceLimit resourceLimit.hs -dcore-lint -dstg-lint -dcmm-lint -no-user-package-db -rtsopts -fno-warn-missed-specialisations -fshow-warning-groups -fdiagnostics-color=never -fno-diagnostics-show-caret -Werror=compat -dno-debug-output  -package unix< 
=====> queryfdoption01(normal) 7375 of 7404 [0, 103, 8]
cd "libraries/unix/tests/queryfdoption01.run" && "/builds/ghc/ghc/inplace/bin/ghc-stage2" -o queryfdoption01 queryfdoption01.hs -dcore-lint -dstg-lint -dcmm-lint -no-user-package-db -rtsopts -fno-warn-missed-specialisations -fshow-warning-groups -fdiagnostics-color=never -fno-diagnostics-show-caret -Werror=compat -dno-debug-output -package unix<
cd "libraries/unix/tests/forkprocess01.run" && ./forkprocess01 <
=====> forkprocess01(threaded1_ls) 7375 of 7404 [0, 103, 8]
cd "libraries/unix/tests/forkprocess01.run" && "/builds/ghc/ghc/inplace/bin/ghc-stage2" -o forkprocess01 forkprocess01.hs -dcore-lint -dstg-lint -dcmm-lint -no-user-package-db -rtsopts -fno-warn-missed-specialisations -fshow-warning-groups -fdiagnostics-color=never -fno-diagnostics-show-caret -Werror=compat -dno-debug-output -threaded -debug -package unix<
cd "libraries/unix/tests/queryfdoption01.run" && ./queryfdoption01 < queryfdoption01.stdin
=====> getEnvironment01(normal) 7376 of 7404 [0, 103, 8]
cd "libraries/unix/tests/getEnvironment01.run" && "/builds/ghc/ghc/inplace/bin/ghc-stage2" -o getEnvironment01 getEnvironment01.hs -dcore-lint -dstg-lint -dcmm-lint -no-user-pack
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validate-x86_64-windows-hadrian Full Build
GO version:   go1.10.8
Built: 2019-10-28T12:49:51+0000
OS/Arch: windows/amd64
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WARNING: Failed to load system CertPool: crypto/x509: system root pool is not available on Windows
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ERROR: Job failed: exit status 1