fix_warnings v0.1.3 FixWarnings.Patch.UnusedVariable

Automatically prefixes unused variables with a “_”. This is the minimal invasive patch, as it preserves meaning from variable names.

Example

warning: variable "my_param" is unused

# Before
def foo(my_param) do
  nil
end

# After
def foo(_my_param) do
  nil
end

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