[Haskell-beginners] Getting debugging going in ghci -- is there no mercy?
Michael Turner
michael.eugene.turner at gmail.com
Wed May 19 12:10:50 UTC 2021
According to the Haskell wiki, "The trace function is located in the
base package", which encouraged me to think it should just work by
starting ghci. No such luck. So then I tried "stack gchi --package
debug". No such luck. I added packages to stack.yaml as suggested. And
here's where I am now.
Of course, I'd like cookbook instructions, but I'm also including all
this error output to give people an idea of how incredibly
demoralizing the experience of being a newbie can be. As a newbie,
it's easy to get confused about what Haskell is actually doing. So
you'd naturally like a way to inspect intermediate results. Which
means you'd like tracing and debugging.
Why is it so hard to get there?
-----------
C:\Users\Michael Turner\aug\aug.cabal was modified manually. Ignoring
C:\Users\Michael Turner\aug\package.yaml in favor of the cabal file.
If you want to use the package.yaml file instead of the cabal file,
then please delete the cabal file.
Using main module: 1. Package `aug' component aug:exe:aug-exe with
main-is file: C:\Users\Michael Turner\aug\app\Main.hs
WARNING: Ignoring transformers-compat's bounds on transformers (>=0.3
&& ==0.2.*); using transformers-0.5.6.2.
Reason: allow-newer enabled.
Error: While constructing the build plan, the following exceptions were
encountered:
In the dependencies for Hoed-0.5.1:
QuickCheck needed, but the stack configuration has no specified version
(latest matching version is 2.14.2)
cereal needed, but the stack configuration has no specified version (latest
matching version is 0.5.8.1)
cereal-text needed, but the stack configuration has no specified version
(latest matching version is 0.1.0.2)
cereal-vector needed, but the stack configuration has no specified version
(latest matching version is 0.2.0.1)
primitive needed, but the stack configuration has no specified version
(latest matching version is 0.7.1.0)
regex-tdfa needed, but the stack configuration has no specified version
(latest matching version is 1.3.1.0)
regex-tdfa-text needed, but the stack configuration has no specified version
(latest matching version is 1.0.0.3)
semigroups needed, but the stack configuration has no specified version
(latest matching version is 0.19.1)
strict needed, but the stack configuration has no specified version (latest
matching version is 0.4.0.1)
terminal-size needed, but the stack configuration has no specified version
(latest matching version is 0.3.2.1)
vector-th-unbox needed, but the stack configuration has no specified version
(latest matching version is 0.2.1.9)
needed due to debug-0.1.1 -> Hoed-0.5.1
In the dependencies for aeson-1.5.6.0:
attoparsec must match >=0.13.2.2 && <0.15, but the stack
configuration has no
specified version (latest matching version is 0.14.1)
base-compat-batteries must match >=0.10.0 && <0.12, but the stack
configuration has no specified version
(latest matching
version is 0.11.2)
data-fix must match >=0.3 && <0.4, but the stack configuration has no
specified version (latest matching version is 0.3.1)
dlist must match >=0.8.0.4 && <1.1, but the stack configuration has no
specified version (latest matching version is 1.0)
primitive must match >=0.7.0.1 && <0.8, but the stack configuration has no
specified version (latest matching version is 0.7.1.0)
scientific must match >=0.3.6.2 && <0.4, but the stack configuration has no
specified version (latest matching version is 0.3.6.2)
strict must match >=0.4 && <0.5, but the stack configuration has
no specified
version (latest matching version is 0.4.0.1)
tagged must match >=0.8.6 && <0.9, but the stack configuration has no
specified version (latest matching version is 0.8.6.1)
th-abstraction must match >=0.2.8.0 && <0.5, but the stack configuration has
no specified version (latest matching version is 0.4.2.0)
these must match >=1.1 && <1.2, but the stack configuration has no specified
version (latest matching version is 1.1.1.1)
time-compat must match >=1.9.4 && <1.10, but the stack configuration has no
specified version (latest matching version is 1.9.5)
uuid-types must match >=1.0.3 && <1.1, but the stack configuration has no
specified version (latest matching version is 1.0.5)
needed due to debug-0.1.1 -> aeson-1.5.6.0
In the dependencies for libgraph-1.14:
monads-tf needed, but the stack configuration has no specified version
(latest matching version is 0.1.0.3)
union-find must match >=0.2, but the stack configuration has no specified
version (latest matching version is 0.2)
needed due to debug-0.1.1 -> libgraph-1.14
In the dependencies for prettyprinter-compat-ansi-wl-pprint-1.0.1:
prettyprinter-ansi-terminal must match >=1.1 && <1.2, but the stack
configuration has no specified version (latest
matching version is 1.1.2)
needed due to debug-0.1.1 -> prettyprinter-compat-ansi-wl-pprint-1.0.1
In the dependencies for uniplate-1.6.13:
syb needed, but the stack configuration has no specified version (latest
matching version is 0.7.2.1)
needed due to debug-0.1.1 -> uniplate-1.6.13
In the dependencies for vector-0.12.3.0:
primitive must match >=0.6.4.0 && <0.8, but the stack configuration has no
specified version (latest matching version is 0.7.1.0)
needed due to debug-0.1.1 -> vector-0.12.3.0
In the dependencies for yaml-0.11.5.0:
attoparsec must match >=0.11.3.0, but the stack configuration has
no specified
version (latest matching version is 0.14.1)
conduit must match >=1.2.8 && <1.4, but the stack configuration has no
specified version (latest matching version is 1.3.4.1)
libyaml must match >=0.1 && <0.2, but the stack configuration has
no specified
version (latest matching version is 0.1.2)
resourcet must match >=0.3 && <1.3, but the stack configuration has no
specified version (latest matching version is 1.2.4.2)
scientific must match >=0.3, but the stack configuration has no specified
version (latest matching version is 0.3.6.2)
needed due to debug-0.1.1 -> yaml-0.11.5.0
Some different approaches to resolving this:
* Recommended action: try adding the following to your extra-deps
in C:\Users\Michael Turner\aug\stack.yaml:
- QuickCheck-2.14.2 at sha256:4ce29211223d5e6620ebceba34a3ca9ccf1c10c0cf387d48aea45599222ee5aa,7736
- attoparsec-0.14.1 at sha256:5a11f0339fb7e65429683e8a36d44adca3fd8cd40704525969c691e359c48fa0,5966
- base-compat-batteries-0.11.2 at sha256:eb3b976007754ddc16e8d4afacdd1e575ae746edb57dcd0a1a728ccd4b372a69,8804
- cereal-0.5.8.1 at sha256:37cb7a78c84412e94592a658768320c41f015f2b8707a433de835afb8ebc18d7,2767
- cereal-text-0.1.0.2 at sha256:dc10e00d9e5047d16a129682aac42c95da188d22e9f85856add051b9ace539c3,1349
- cereal-vector-0.2.0.1 at sha256:26d8e359f4c0de6dc06bf29f1cc2805847cdd8576d9f1598ecb263a1ca372bec,1116
- conduit-1.3.4.1 at sha256:eeabaf3f822e3e15317995766f50ef4a20371bdc3bb4721a7541e37228018dcf,5129
- data-fix-0.3.1 at sha256:7aee2c0633632479cef93c8000befd5bc950ba7c329d69e918ca520944164e27,1645
- dlist-1.0 at sha256:124cb3aa1decebd5171b46601b1f74cca6cfae12d266ace3799b86dd05ef7cb4,3560
- libyaml-0.1.2 at sha256:7f14f69ceb14659699974e8e47e1ea6f226ea21ff42a802db03e721c319d201d,2125
- monads-tf-0.1.0.3 at sha256:25b5d97af98adf7eca709c57f159c6c24c773cbb30e153abaeb156d81a451195,1427
- prettyprinter-ansi-terminal-1.1.2 at sha256:90b3b7650bc5b9f0e58da43621d23c817acfc0cf5ce71244b9bd11b8c9f95e3a,2653
- primitive-0.7.1.0 at sha256:29de6bfd0cf8ba023ceb806203dfbec0e51e3524e75ffe41056f70b4229c6f0f,2728
- regex-tdfa-1.3.1.0 at sha256:eb8d0f007cf45faca8574f56f0d19c9b02bc529ef1688d8f8a9751ce7dc36cc3,6483
- regex-tdfa-text-1.0.0.3 at sha256:fb72123627eadf43dd5ca74a2896940d50aac291e61f62177960f0563f7d5c03,1180
- resourcet-1.2.4.2 at sha256:d57516781d1721f70aa0b9ec8ea9200ab02bf76349cb76d73ad57729302289cc,1730
- scientific-0.3.6.2 at sha256:dd49abc76bd8e2b57e7a057dc2bb742a00527b4bf9350f9374be03b5934e55d8,4679
- semigroups-0.19.1 at sha256:ecae129621e0d2f77bef2f01e4458c2e0567ab6e1f39579c61d7cec8058ebb0e,6262
- strict-0.4.0.1 at sha256:08cf72ad570fddfe3b3424117bf20a303a1fb21047b40c1d6c8004c0e3e02a0b,4124
- syb-0.7.2.1 at sha256:bf42655a213402215299e435c52f799e76cbec0b984cd7153d6b9af8a1c0803f,3815
- tagged-0.8.6.1 at sha256:5ddf1e324c3cd644f097a48bf490f0bedf467f723fd240afb3ab3b750577f8e7,2874
- terminal-size-0.3.2.1 at sha256:7b2d8e0475a46961d07ddfb91dee618de70eff55d9ba0402ebeac1f9dcf9b18b,1259
- th-abstraction-0.4.2.0 at sha256:6ba7b201931f614173755f060fdf98f02095df68c1f7bc3e2691cf9d443e81f9,2194
- these-1.1.1.1 at sha256:e981c65228db5ae77a043631f74a1e4a4b770f7213866f584e3476b52512f1af,2631
- time-compat-1.9.5 at sha256:a586bd5a59b47ea0c9eafc55c6936ede11126f4a6e619d6d7aeefee73c43d9b8,4954
- union-find-0.2 at sha256:22e97cd9aeb8c96bf7cd8d359d4eda635dc0e0a6cd91b9a07e5a203b00949c8d,1232
- uuid-types-1.0.5 at sha256:5031383749d57cb95877d7e56f0300be66652b6e57f5ba6681dcc6e4f78d046d,2541
- vector-th-unbox-0.2.1.9 at sha256:5723d9c8a8a941dfeeb59dc42b84b924e4548ab6b5a4afe5b62b39f54667c2dd,1520
Error: Plan construction failed.
Warning: Build failed, but trying to launch GHCi anyway
The following GHC options are incompatible with GHCi and have not been
passed to it: -threaded
Configuring GHCi with the following packages: aug
* * * * * * * *
Warning: Multiple files use the same module name:
* Paths_aug found at the following paths
* C:\Users\Michael
Turner\aug\.stack-work\dist\e626a42b\build\aug-exe\autogen\Paths_aug.hs
(aug:exe:aug-exe)
* C:\Users\Michael
Turner\aug\.stack-work\dist\e626a42b\build\autogen\Paths_aug.hs
(aug:lib)
* * * * * * * *
GHCi, version 8.6.5: http://www.haskell.org/ghc/ :? for help
<command line>: cannot satisfy -package debug
(use -v for more information)
Regards,
Michael Turner
Executive Director
Project Persephone
1-25-33 Takadanobaba
Shinjuku-ku Tokyo 169-0075
Mobile: +81 (90) 5203-8682
turner at projectpersephone.org
Understand - http://www.projectpersephone.org/
Join - http://www.facebook.com/groups/ProjectPersephone/
Donate - http://www.patreon.com/ProjectPersephone
Volunteer - https://github.com/ProjectPersephone
"Love does not consist in gazing at each other, but in looking outward
together in the same direction." -- Antoine de Saint-Exupéry
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