Remove several dead -Z options.

src/librustc_interface/tests.rs

@@ -560,8 +560,6 @@ fn test_debugging_options_tracking_hash() {
     assert_eq!(reference.dep_tracking_hash(), opts.dep_tracking_hash());
     opts.debugging_opts.keep_hygiene_data = true;
     assert_eq!(reference.dep_tracking_hash(), opts.dep_tracking_hash());
-    opts.debugging_opts.keep_ast = true;
-    assert_eq!(reference.dep_tracking_hash(), opts.dep_tracking_hash());
     opts.debugging_opts.print_mono_items = Some(String::from("abc"));
     assert_eq!(reference.dep_tracking_hash(), opts.dep_tracking_hash());
     opts.debugging_opts.dump_mir = Some(String::from("abc"));

src/librustc_session/options.rs

@@ -793,8 +793,6 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "enable incremental compilation (experimental)"),
     incremental_info: bool = (false, parse_bool, [UNTRACKED],
         "print high-level information about incremental reuse (or the lack thereof)"),
-    incremental_dump_hash: bool = (false, parse_bool, [UNTRACKED],
-        "dump hash information in textual format to stdout"),
     incremental_verify_ich: bool = (false, parse_bool, [UNTRACKED],
         "verify incr. comp. hashes of green query instances"),
     incremental_ignore_spans: bool = (false, parse_bool, [UNTRACKED],
@@ -819,8 +817,6 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "don't generate DWARF address ranges that give faster lookups"),
     keep_hygiene_data: bool = (false, parse_bool, [UNTRACKED],
         "don't clear the hygiene data after analysis"),
-    keep_ast: bool = (false, parse_bool, [UNTRACKED],
-        "keep the AST after lowering it to HIR"),
     show_span: Option<String> = (None, parse_opt_string, [TRACKED],
         "show spans for compiler debugging (expr|pat|ty)"),
     print_type_sizes: bool = (false, parse_bool, [UNTRACKED],
@@ -855,8 +851,6 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "print some statistics about AST and HIR"),
     always_encode_mir: bool = (false, parse_bool, [TRACKED],
         "encode MIR of all functions into the crate metadata"),
-    json_rendered: Option<String> = (None, parse_opt_string, [UNTRACKED],
-        "describes how to render the `rendered` field of json diagnostics"),
     unleash_the_miri_inside_of_you: bool = (false, parse_bool, [TRACKED],
         "take the breaks off const evaluation. NOTE: this is unsound"),
     osx_rpath_install_name: bool = (false, parse_bool, [TRACKED],
@@ -887,8 +881,6 @@ options! {DebuggingOptions, DebuggingSetter, basic_debugging_options,
         "emit diagnostics rather than buffering (breaks NLL error downgrading, sorting)."),
     polonius: bool = (false, parse_bool, [UNTRACKED],
         "enable polonius-based borrow-checker"),
-    codegen_time_graph: bool = (false, parse_bool, [UNTRACKED],
-        "generate a graphical HTML report of time spent in codegen and LLVM"),
     thinlto: Option<bool> = (None, parse_opt_bool, [TRACKED],
         "enable ThinLTO when possible"),
     inline_in_all_cgus: Option<bool> = (None, parse_opt_bool, [TRACKED],