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Fix crash when singleton types are passed to generic methods #355

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Merged
mame merged 1 commit into from
Dec 23, 2025
Merged

Fix crash when singleton types are passed to generic methods #355

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4 changes: 4 additions & 0 deletions lib/typeprof/core/env.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,10 @@ def get_instance_type(mod, type_args, changes, base_ty_env, base_ty)
base_ty.mod.type_params.zip(base_ty.args) do |param, arg|
ty_env[param] = arg || Source.new
end
elsif base_ty.is_a?(Type::Singleton)
base_ty.mod.type_params&.each do |param|
ty_env[param] = Source.new
end
end
args = mod.type_params.zip(type_args).map do |param, arg|
arg && changes ? arg.covariant_vertex(self, changes, ty_env) : Source.new
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7 changes: 7 additions & 0 deletions scenario/regressions/singleton-type-param.rb
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@@ -0,0 +1,7 @@
## update
# Passing class constants (Singleton types) to methods like `all?`
# should not crash with "unknown type variable" error
[].all?(Array)
[].all?(Hash)

## assert