Sync SyntaxSuggest

```
$ tool/sync_default_gems.rb syntax_suggest
```

lib/syntax_suggest/display_invalid_blocks.rb

@@ -0,0 +1,84 @@
+# frozen_string_literal: true
+
+require_relative "capture_code_context"
+require_relative "display_code_with_line_numbers"
+
+module SyntaxSuggest
+  # Used for formatting invalid blocks
+  class DisplayInvalidBlocks
+    attr_reader :filename
+
+    def initialize(code_lines:, blocks:, io: $stderr, filename: nil, terminal: DEFAULT_VALUE)
+      @io = io
+      @blocks = Array(blocks)
+      @filename = filename
+      @code_lines = code_lines
+
+      @terminal = terminal == DEFAULT_VALUE ? io.isatty : terminal
+    end
+
+    def document_ok?
+      @blocks.none? { |b| !b.hidden? }
+    end
+
+    def call
+      if document_ok?
+        @io.puts "Syntax OK"
+        return self
+      end
+
+      if filename
+        @io.puts("--> #{filename}")
+        @io.puts
+      end
+      @blocks.each do |block|
+        display_block(block)
+      end
+
+      self
+    end
+
+    private def display_block(block)
+      # Build explanation
+      explain = ExplainSyntax.new(
+        code_lines: block.lines
+      ).call
+
+      # Enhance code output
+      # Also handles several ambiguious cases
+      lines = CaptureCodeContext.new(
+        blocks: block,
+        code_lines: @code_lines
+      ).call
+
+      # Build code output
+      document = DisplayCodeWithLineNumbers.new(
+        lines: lines,
+        terminal: @terminal,
+        highlight_lines: block.lines
+      ).call
+
+      # Output syntax error explanation
+      explain.errors.each do |e|
+        @io.puts e
+      end
+      @io.puts
+
+      # Output code
+      @io.puts(document)
+    end
+
+    private def code_with_context
+      lines = CaptureCodeContext.new(
+        blocks: @blocks,
+        code_lines: @code_lines
+      ).call
+
+      DisplayCodeWithLineNumbers.new(
+        lines: lines,
+        terminal: @terminal,
+        highlight_lines: @invalid_lines
+      ).call
+    end
+  end
+end