@debug the next REPL line before evaling it (#2179)

src/DocTests.jl

@@ -240,10 +240,12 @@ mutable struct Result
 end
 
 function eval_repl(block, sandbox, meta::Dict, doc::Documenter.Document, page)
+    src_lines = Documenter.find_block_in_file(block.code, meta[:CurrentFile])
     for (input, output) in repl_splitter(block.code)
         result = Result(block, input, output, meta[:CurrentFile])
         for (ex, str) in Documenter.parseblock(input, doc, page; keywords = false, raise=false)
             # Input containing a semi-colon gets suppressed in the final output.
+            @debug "Evaluating REPL line from doctest at $(Documenter.locrepr(result.file, src_lines))" unparsed_string = str parsed_expression = ex
             result.hide = REPL.ends_with_semicolon(str)
             # Use the REPL softscope for REPL jldoctests,
             # see https://github.com/JuliaLang/julia/pull/33864