Fails to build with crystal 0.36

[peterhoeg]

Fails with Error: instance variable @documentation of LSP::Protocol::CompletionItem was inferred to be Nil, but Nil alone provides no information.

I haven't looked at a fix so raising the issue here so everybody knows.

building '/nix/store/0w6jjsv61n1hgrrndy3z38jn2cwhwbiq-scry-0.8.1.20200902.drv'...
unpacking sources
unpacking source archive /nix/store/avb0msb4q2xa11l9an805dfijv54v84i-source
source root is source
patching sources
configuring
building
lsp: checking...
Dependencies are satisfied
Building: scry
crystal build -o /build/source/bin/scry src/scry.cr --release --progress
Error target scry failed to compile:
Showing last frame. Use --error-trace for full trace.

In lib/lsp/src/lsp/protocol/completion_item.cr:77:70

 77 | def initialize(@label, @kind, @detail, @data, insert_text = nil, @documentation = nil)
                                                                       ^
Error: instance variable @documentation of LSP::Protocol::CompletionItem was inferred to be Nil, but Nil alone provides no information

error: --- Error -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- nix-build
builder for '/nix/store/0w6jjsv61n1hgrrndy3z38jn2cwhwbiq-scry-0.8.1.20200902.drv' failed with exit code 1; last 10 log lines:
  crystal build -o /build/source/bin/scry src/scry.cr --release --progress
  Error target scry failed to compile:
  Showing last frame. Use --error-trace for full trace.
  
  In lib/lsp/src/lsp/protocol/completion_item.cr:77:70
  
   77 | def initialize(@label, @kind, @detail, @data, insert_text = nil, @documentation = nil)
                                                                         ^
  Error: instance variable @documentation of LSP::Protocol::CompletionItem was inferred to be Nil, but Nil alone provides no information

[alexherbo2]

I have the same issue.