haskell / haskell/haskell-language-server
High cpu and memory usage with lens typed holes
- Dominant language
- Haskell
- Stars
- 3k
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- Avg merge
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- Merged PRs (30d)
- 11
Description
### Your environment
WSL2 Ubuntu 20.04
vscode-haskell
my cabal file
```cabal
cabal-version: 2.4
name: hls-lens-hole
version: 0.1.0.0
executable hls-lens-hole
main-is: Main.hs
build-depends: base ^>=4.14.3.0, lens
hs-source-dirs: app
default-language: Haskell2010
```
ghc version
```
The Glorious Glasgow Haskell Compilation System, version 8.10.7
```
cabal
```
cabal-install version 3.6.2.0
compiled using version 3.6.2.0 of the Cabal library
```
HLS version (vscode-haskell installs the latest version automatically)
```
ls ~/.vscode-server/data/User/globalStorage/haskell.haskell/
haskell-language-server-wrapper-1.6.1.0-linux
haskell-language-server-1.6.1.0-linux-8.10.7
```
### Steps to reproduce
open the following code in vscode
```hs
pair :: IndexedFold Bool (a, a) a
pair p (a, b) = _ -- (,) <$> indexed p False a <*> indexed p True b
```
hover over the hole, then inspect other variables (e.g. `a` or `b`).
### Expected behaviour
don't crash
### Actual behaviour
HLS may be slow with some holes (lens is big) but it shouldn't crash. HLS tries to load but not showing the result (cpu and memory usage are super high), after a few tries it crashes.
Contributor guide
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Assessment
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