stack build hangs when I add yesod-core-1.7.0.0 to extra-deps

[simonmichael]

General summary/comments (optional)

I'm trying to build hledger-web with a newer yesod-core, 1.7.0.0. When I add it to extra-deps, builds hang, seemingly on unrelated packages.

Steps to reproduce

For example:

1. git clone --depth 1 --revision e8f4d43dcf58a5731b1e2c95be9d8bf4c236e352 https://github.com/simonmichael/hledger
2. cd hledger
3. stack build hledger-web # succeeds
4. add extra dep (and bump bounds)

git apply <<'PATCH'
diff --git a/hledger-web/hledger-web.cabal b/hledger-web/hledger-web.cabal
index 922dbcb21..da9de2284 100644
--- a/hledger-web/hledger-web.cabal
+++ b/hledger-web/hledger-web.cabal
@@ -203,3 +203,3 @@ library
     , yesod >=1.4 && <1.7
-    , yesod-core >=1.4 && <1.7
+    , yesod-core >=1.4 && <1.8
     , yesod-form >=1.4 && <1.8
diff --git a/hledger-web/package.yaml b/hledger-web/package.yaml
index 1ad170474..efd11a645 100644
--- a/hledger-web/package.yaml
+++ b/hledger-web/package.yaml
@@ -148,3 +148,3 @@ library:
   - yesod        >=1.4 && < 1.7
-  - yesod-core   >=1.4 && < 1.7
+  - yesod-core   >=1.4 && < 1.8
   - yesod-form   >=1.4 && < 1.8
diff --git a/stack.yaml b/stack.yaml
index 25364eead..a4a4885fa 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -22,2 +22,3 @@ extra-deps:
 - haskeline-0.8.4.1
+- yesod-core-1.7.0.0
 allow-newer: true
PATCH

5. stack build hledger-web # hangs while building on one package or another

Expected

Expected the second build to succeed

Actual

It hangs.

Stack version

stack --version
Version 3.11.1, Git revision 979bf6339fd4d5837c4d2fa8166dc715eef30ee2 x86_64 hpack-0.39.6

Method of installation

• Official binary, installed via stack upgrade IIRC

Platform

macos tahoe 26.5

[mpilgrem]

I could not reproduce this on a Mac mini M1, 2020/macOS 26.2 and Stack 3.9.3. It built fine (building all the dependencies as GHC 9.14.1 was new to my machine), and ended up with:

$ stack ls dependencies
Cabal 3.16.0.0
Cabal-syntax 3.16.0.0
Decimal 0.5.2
Diff 1.0.2
Glob 0.10.2
HUnit 1.6.2.0
OneTuple 0.4.3
Only 0.1
QuickCheck 2.16.0.0
RSA 2.4.1
SHA 1.6.4.4
StateVar 1.2.2
aeson 2.3.0.0
aeson-pretty 0.8.10
alex 3.5.4.2
ansi-terminal 1.1.5
ansi-terminal-types 1.1.3
appar 0.1.8
array 0.5.8.0
asn1-encoding 0.9.6
asn1-parse 0.9.5
asn1-types 0.3.4
assoc 1.1.1
async 2.2.6
attoparsec 0.14.4
attoparsec-aeson 2.2.2.0
authenticate-oauth 1.7
auto-update 0.2.6
base 4.22.0.0
base-compat 0.14.1
base-orphans 0.9.4
base-unicode-symbols 0.2.4.2
base16-bytestring 1.0.2.0
base64 1.0
base64-bytestring 1.2.1.0
basement 0.0.16
bifunctors 5.6.3
bimap 0.5.0
binary 0.8.9.3
bitvec 1.1.6.0
blaze-builder 0.4.4.1
blaze-html 0.9.2.0
blaze-markup 0.8.3.0
brick 2.12
bsb-http-chunked 0.0.0.4
byteable 0.1.1
byteorder 1.0.4
bytestring 0.12.2.0
cabal-doctest 1.0.12
call-stack 0.4.0
case-insensitive 1.2.1.0
cassava 0.5.4.1
cassava-megaparsec 2.1.1
cborg 0.2.10.0
cereal 0.5.8.3
character-ps 0.1
clientsession 0.9.3.0
clock 0.8.4
cmdargs 0.10.22
colour 2.3.7
comonad 5.0.10
conduit 1.3.6.1
conduit-extra 1.3.8
config-ini 0.2.7.0
containers 0.8
contravariant 1.5.6
control-monad-free 0.6.2
cookie 0.5.1
crypto-api 0.13.3
crypto-pubkey-types 0.4.3
cryptohash-md5 0.11.101.0
crypton 1.0.6
crypton-conduit 0.2.3
crypton-connection 0.4.5
crypton-socks 0.6.2
crypton-x509 1.7.7
crypton-x509-store 1.6.14
crypton-x509-system 1.6.8
crypton-x509-validation 1.6.14
css-text 0.1.3.0
csv 0.1.2
data-clist 0.2
data-default 0.8.0.2
data-default-class 0.2.0.0
data-fix 0.3.4
deepseq 1.5.1.0
directory 1.3.10.0
distributive 0.6.3
dlist 1.0
doclayout 0.5.0.2
easy-file 0.2.5
ech-config 0.0.1
email-validate 2.3.2.21
emojis 0.1.4.1
encoding 0.10.2
entropy 0.4.1.11
exceptions 0.10.11
extensible-exceptions 0.1.1.4
extra 1.8.1
fast-logger 3.2.6
file-embed 0.0.16.0
file-io 0.1.5
filepath 1.5.4.0
fsnotify 0.4.4.0
ghc-bignum 1.4
ghc-boot-th 9.14.1
ghc-internal 9.1401.0
ghc-prim 0.13.1
githash 0.1.7.0
half 0.3.3
happy 2.1.7
happy-lib 2.1.7
hashable 1.5.1.0
hashtables 1.4.2
haskeline 0.8.4.1
haskell-lexer 1.2.1
haskell-src-exts 1.23.1
haskell-src-meta 0.8.15
hfsevents 0.1.8
hjsmin 0.2.1
hledger 1.99
hledger-lib 1.99
hledger-ui 1.99
hledger-web 1.99
hourglass 0.2.12
hpke 0.0.0
hspec 2.11.17
hspec-core 2.11.17
hspec-discover 2.11.17
hspec-expectations 0.8.4
html 1.0.1.2
html-conduit 1.3.2.2
http-api-data 0.6.3
http-client 0.7.19
http-client-tls 0.3.6.4
http-conduit 2.3.9.1
http-date 0.0.11
http-semantics 0.4.0
http-types 0.12.5
http2 5.4.0
indexed-traversable 0.1.5
indexed-traversable-instances 0.1.2.1
integer-conversion 0.1.1
integer-gmp 1.1
integer-logarithms 1.0.5
iproute 1.7.15
language-javascript 0.7.1.0
libyaml 0.1.4
libyaml-clib 0.2.5
lift-type 0.1.2.0
lifted-base 0.2.3.12
lucid 2.11.20260427
math-functions 0.3.4.4
megaparsec 9.7.0
memory 0.18.0
microlens 0.4.14.0
microlens-ghc 0.4.15.1
microlens-mtl 0.2.1.0
microlens-platform 0.4.4.1
microlens-th 0.4.3.17
mime-types 0.1.2.2
mmorph 1.2.2
modern-uri 0.3.6.1
monad-control 1.0.3.1
monad-logger 0.3.42
monad-loops 0.4.3
mono-traversable 1.0.21.0
mtl 2.3.1
mtl-compat 0.2.2
network 3.2.8.0
network-byte-order 0.1.8
network-control 0.1.7
network-uri 2.6.4.2
old-locale 1.0.0.7
old-time 1.1.1.0
optparse-applicative 0.19.0.0
os-string 2.0.8
parsec 3.1.18.0
parser-combinators 1.3.1
path-pieces 0.2.1
pem 0.2.4
persistent 2.18.1.0
persistent-template 2.12.0.0
pretty 1.1.3.6
pretty-show 1.10
pretty-simple 4.1.4.0
prettyprinter 1.7.2
prettyprinter-ansi-terminal 1.1.4
primitive 0.9.1.0
process 1.6.26.1
profunctors 5.6.3
psqueues 0.2.8.3
quickcheck-io 0.2.0
quote-quot 0.2.1.0
random 1.3.1
recv 0.1.1
reflection 2.1.9
regex-base 0.94.0.3
regex-compat 0.95.2.2
regex-posix 0.96.0.2
regex-tdfa 1.3.2.5
replace-megaparsec 1.5.0.1
req 3.13.4
resource-pool 0.5.0.0
resourcet 1.3.0
retry 0.9.3.1
rts 1.0.3
safe 0.3.21
safe-exceptions 0.1.7.4
scientific 0.3.8.1
semialign 1.3.1.1
semigroupoids 6.0.2
serialise 0.2.6.1
setenv 0.1.1.3
shakespeare 2.2.0
silently 1.2.5.4
simple-sendfile 0.2.32
skein 1.0.9.4
split 0.2.5
splitmix 0.1.3.2
stm 2.5.3.1
stm-chans 3.0.0.11
streaming-commons 0.2.3.1
strict 0.5.1
string-interpolate 0.3.4.0
syb 0.7.4
tabular 0.2.2.8
tagged 0.8.10
tagsoup 0.14.8
tasty 1.5.4
tasty-hunit 0.10.2
template-haskell 2.24.0.0
temporary 1.3
terminal-size 0.3.4
terminfo 0.4.1.7
text 2.1.3
text-ansi 0.3.0.1
text-builder-linear 0.1.3
text-conversions 0.3.1.1
text-iso8601 0.2.0.0
text-short 0.1.6.1
text-zipper 0.13
th-abstraction 0.7.2.0
th-compat 0.1.7
th-expand-syns 0.4.12.0
th-lift 0.8.7
th-lift-instances 0.1.20
th-orphans 0.13.17
th-reify-many 0.1.10
these 1.2.1
time 1.15
time-compat 1.9.9
time-manager 0.3.2
timeit 2.0
tls 2.1.14
transformers 0.6.1.2
transformers-base 0.4.6.1
transformers-compat 0.7.2
typed-process 0.2.13.0
uglymemo 0.1.0.1
unix 2.8.8.0
unix-compat 0.7.4.1
unix-time 0.4.17
unliftio 0.2.25.1
unliftio-core 0.2.1.0
unordered-containers 0.2.21
utf8-string 1.0.2
utility-ht 0.0.17.2
uuid-types 1.0.6.1
vault 0.3.1.6
vector 0.13.2.0
vector-algorithms 0.9.1.0
vector-stream 0.1.0.1
vty 6.5
vty-crossplatform 0.5.0.0
vty-unix 0.2.0.0
wai 3.2.4
wai-app-static 3.2.1
wai-cors 0.2.7
wai-extra 3.1.18
wai-handler-launch 3.0.3.1
wai-logger 2.5.0
warp 3.4.13.1
witherable 0.5
wizards 1.0.3
word-wrap 0.5
word8 0.1.3
xml-conduit 1.10.1.0
xml-types 0.3.8
xss-sanitize 0.3.7.2
yaml 0.11.11.2
yesod 1.6.2.1
yesod-core 1.7.0.0
yesod-form 1.7.9.2
yesod-persistent 1.6.0.8
yesod-static 1.6.1.2
yesod-test 1.7.0.1
zlib 0.7.1.1

It also worked with Stack 3.11.1 but, of course, by then, all the dependencies had been built.

[mpilgrem]

I upgraded to macOS 26.5.1 and Stack 3.11.1, deleted the snapshots directory (so everything would need to be rebuilt) and still could not reproduce the experience of undue pauses in the build.

[simonmichael]

Darn! Thank you for trying. I'll keep poking at it.

[simonmichael]

I can still reproduce the hang here. But at least I've found that it is triggered by conflicting versions of the yesod* packages. I had pinned yesod-core-1.7.0.0 in extra-deps, but was using the nightly-2026-06-01 snapshot's versions of other yesod packages (yesod, yesod-form, yesod-persistent, yesod-static etc). allow-newer was enabled, but something about the yesod package in particular conflicted; if I added the newer version of just the yesod package to extra-deps, that was enough to fix the hang.

In the end, I have worked around by updating to the latest nightly-2026-06-22, in which those yesod packages have been updated to allow yesod-core 1.7.