Remove PpAstTreeMode.

It's simpler to distinguish the two AST modes directly in `PpMode`.

Author: nnethercote

compiler/rustc_driver_impl/src/pretty.rs

@@ -8,7 +8,7 @@ use rustc_hir_pretty as pprust_hir;
 use rustc_middle::hir::map as hir_map;
 use rustc_middle::mir::{write_mir_graphviz, write_mir_pretty};
 use rustc_middle::ty::{self, TyCtxt};
-use rustc_session::config::{OutFileName, PpAstTreeMode, PpHirMode, PpMode, PpSourceMode};
+use rustc_session::config::{OutFileName, PpHirMode, PpMode, PpSourceMode};
 use rustc_session::Session;
 use rustc_span::symbol::Ident;
 use rustc_span::FileName;
@@ -382,7 +382,7 @@ pub fn print_after_parsing(sess: &Session, krate: &ast::Crate, ppm: PpMode) {
                 )
             })
         }
-        AstTree(PpAstTreeMode::Normal) => {
+        AstTree => {
             debug!("pretty printing AST tree");
             format!("{krate:#?}")
         }
@@ -420,7 +420,7 @@ pub fn print_after_hir_lowering<'tcx>(tcx: TyCtxt<'tcx>, ppm: PpMode) {
             })
         }
 
-        AstTree(PpAstTreeMode::Expanded) => {
+        AstTreeExpanded => {
             debug!("pretty-printing expanded AST");
             format!("{:#?}", tcx.resolver_for_lowering(()).borrow().1)
         }

compiler/rustc_session/src/config.rs

@@ -2918,8 +2918,8 @@ fn parse_pretty(handler: &EarlyErrorHandler, unstable_opts: &UnstableOptions) ->
         "expanded" => Source(PpSourceMode::Expanded),
         "expanded,identified" => Source(PpSourceMode::ExpandedIdentified),
         "expanded,hygiene" => Source(PpSourceMode::ExpandedHygiene),
-        "ast-tree" => AstTree(PpAstTreeMode::Normal),
-        "ast-tree,expanded" => AstTree(PpAstTreeMode::Expanded),
+        "ast-tree" => AstTree,
+        "ast-tree,expanded" => AstTreeExpanded,
         "hir" => Hir(PpHirMode::Normal),
         "hir,identified" => Hir(PpHirMode::Identified),
         "hir,typed" => Hir(PpHirMode::Typed),
@@ -3076,14 +3076,6 @@ pub enum PpSourceMode {
     ExpandedHygiene,
 }
 
-#[derive(Copy, Clone, PartialEq, Debug)]
-pub enum PpAstTreeMode {
-    /// `-Zunpretty=ast`
-    Normal,
-    /// `-Zunpretty=ast,expanded`
-    Expanded,
-}
-
 #[derive(Copy, Clone, PartialEq, Debug)]
 pub enum PpHirMode {
     /// `-Zunpretty=hir`
@@ -3099,7 +3091,10 @@ pub enum PpMode {
     /// Options that print the source code, i.e.
     /// `-Zunpretty=normal` and `-Zunpretty=expanded`
     Source(PpSourceMode),
-    AstTree(PpAstTreeMode),
+    /// `-Zunpretty=ast-tree`
+    AstTree,
+    /// `-Zunpretty=ast-tree,expanded`
+    AstTreeExpanded,
     /// Options that print the HIR, i.e. `-Zunpretty=hir`
     Hir(PpHirMode),
     /// `-Zunpretty=hir-tree`
@@ -3119,10 +3114,10 @@ impl PpMode {
         use PpMode::*;
         use PpSourceMode::*;
         match *self {
-            Source(Normal | Identified) | AstTree(PpAstTreeMode::Normal) => false,
+            Source(Normal | Identified) | AstTree => false,
 
             Source(Expanded | ExpandedIdentified | ExpandedHygiene)
-            | AstTree(PpAstTreeMode::Expanded)
+            | AstTreeExpanded
             | Hir(_)
             | HirTree
             | ThirTree
@@ -3134,7 +3129,7 @@ impl PpMode {
     pub fn needs_hir(&self) -> bool {
         use PpMode::*;
         match *self {
-            Source(_) | AstTree(_) => false,
+            Source(_) | AstTree | AstTreeExpanded => false,
 
             Hir(_) | HirTree | ThirTree | ThirFlat | Mir | MirCFG => true,
         }