Replace awkward code changes with steep:ignore

Also remove RBS for currently ignored files. Will follow-up when those
check fully in later PRs.

.gitignore

@@ -58,7 +58,6 @@ out.svg
 /sig/prism/node.rbs
 /sig/prism/visitor.rbs
 /sig/prism/_private/dot_visitor.rbs
-/sig/prism/_private/ripper_compat.rbs
 /rbi/prism.rbi
 
 compile_commands.json

Steepfile

@@ -3,10 +3,8 @@
 target :lib do
   signature "sig"
 
-  # Tell Steep about stdlib require's
-  library "ripper" # RipperCompat
-  library "delegate"  # LexCompat
-  library "cgi"  # DotVisitor
+  # Tell Steep about any stdlib "require"s
+  library "cgi" # in lib/prism/dot_visitor.rb (Prism::DotVisitor)
 
   check "lib"
 
@@ -16,4 +14,5 @@ target :lib do
   ignore "lib/prism/lex_compat.rb"
   ignore "lib/prism/serialize.rb"
   ignore "lib/prism/ffi.rb"
+  ignore "lib/prism/translation"
 end

lib/prism.rb

@@ -44,7 +44,7 @@ module Prism
   #
   # For supported options, see Prism::parse.
   def self.lex_compat(source, **options)
-    LexCompat.new(source, **options).result #: ParseResult[Array[[[Integer, Integer], Symbol, String, untyped]]]
+    LexCompat.new(source, **options).result # steep:ignore
   end
 
   # :call-seq:
@@ -54,7 +54,7 @@ def self.lex_compat(source, **options)
   # returns the same tokens. Raises SyntaxError if the syntax in source is
   # invalid.
   def self.lex_ripper(source)
-    LexRipper.new(source).result
+    LexRipper.new(source).result # steep:ignore
   end
 
   # :call-seq:

lib/prism/parse_result/comments.rb

@@ -188,12 +188,7 @@ def nearest_targets(node, comment)
 
     # Attach the list of comments to their respective locations in the tree.
     def attach_comments!
-      if ProgramNode === value
-        this = self #: ParseResult[ProgramNode]
-        Comments.new(this).attach!
-      else
-        raise
-      end
+      Comments.new(self).attach! # steep:ignore
     end
   end
 end

lib/prism/parse_result/newlines.rb

@@ -58,11 +58,7 @@ def visit_statements_node(node)
 
     # Walk the tree and mark nodes that are on a new line.
     def mark_newlines!
-      if ProgramNode === value
-        value.accept(Newlines.new(Array.new(1 + source.offsets.size, false)))
-      else
-        raise "ParseResult does not contain ProgramNode value"
-      end
+      value.accept(Newlines.new(Array.new(1 + source.offsets.size, false))) # steep:ignore
     end
   end
 end

lib/prism/pattern.rb

@@ -87,11 +87,10 @@ def scan(root)
       return to_enum(__method__ || raise, root) unless block_given?
 
       @compiled ||= compile
-      compiled = @compiled #: Proc
       queue = [root]
 
       while (node = queue.shift)
-        yield node if compiled.call(node)
+        yield node if @compiled.call(node) # steep:ignore
         queue.concat(node.compact_child_nodes)
       end
     end

lib/prism/translation.rb

@@ -3,7 +3,7 @@
 module Prism
   # This module is responsible for converting the prism syntax tree into other
   # syntax trees.
-  module Translation
+  module Translation # steep:ignore
     autoload :Parser, "prism/translation/parser"
     autoload :Ripper, "prism/translation/ripper"
     autoload :RubyParser, "prism/translation/ruby_parser"

prism.gemspec

@@ -133,7 +133,6 @@ Gem::Specification.new do |spec|
     "sig/prism/pack.rbs",
     "sig/prism/parse_result.rbs",
     "sig/prism/pattern.rbs",
-    "sig/prism/ripper_compat.rbs",
     "sig/prism/serialize.rbs",
     "sig/prism/visitor.rbs",
     "rbi/prism.rbi",

templates/template.rb

@@ -588,8 +588,7 @@ def locals
     "sig/prism/mutation_compiler.rbs",
     "sig/prism/node.rbs",
     "sig/prism/visitor.rbs",
-    "sig/prism/_private/dot_visitor.rbs",
-    "sig/prism/_private/ripper_compat.rbs",
+    "sig/prism/_private/dot_visitor.rbs"
   ]
 end