Merge c5621b3794 into cf39338b30

.gitignore

@@ -5,3 +5,5 @@ target
 /invalid
 .direnv/
 g
+perf.data*
+*.svg

Cargo.lock

@@ -113,6 +113,9 @@ dependencies = [
  "tracing",
  "tracing-subscriber",
  "tracing-tree",
+ "tree-sitter",
+ "tree-sitter-edit",
+ "tree-sitter-rust",
  "walkdir",
 ]
 
@@ -855,6 +858,45 @@ dependencies = [
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "tree-sitter"
+version = "0.20.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e747b1f9b7b931ed39a548c1fae149101497de3c1fc8d9e18c62c1a66c683d3d"
+dependencies = [
+ "cc",
+ "regex",
+]
+
+[[package]]
+name = "tree-sitter-edit"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9ed3213ee656e99748eca539913b5c90df3d52618d9a1714e0935013955c8031"
+dependencies = [
+ "tree-sitter",
+ "tree-sitter-traversal",
+]
+
+[[package]]
+name = "tree-sitter-rust"
+version = "0.20.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0832309b0b2b6d33760ce5c0e818cb47e1d72b468516bfe4134408926fa7594"
+dependencies = [
+ "cc",
+ "tree-sitter",
+]
+
+[[package]]
+name = "tree-sitter-traversal"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df8a158225e4a4d8505f071340bba9edd109b23f01b70540dccb7c799868f307"
+dependencies = [
+ "tree-sitter",
+]
+
 [[package]]
 name = "unicode-id"
 version = "0.3.4"

Cargo.toml

@@ -1,6 +1,6 @@
 [workspace]
 members = ["./", "./testsuite"]
-exclude = ["test-cases/*", "full-tests/*"]
+exclude = ["full-tests/*"]
 
 [package]
 name = "cargo-minimize"
@@ -16,8 +16,12 @@ license = "MIT OR Apache-2.0"
 [profile.release]
 lto = "thin"
 
-[profile.dev]
+[profile.dev.package.proc-macro2]
-opt-level = 1
+opt-level = 3
+[profile.dev.package.syn]
+opt-level = 3
+[profile.dev.package.genemichaels]
+opt-level = 3
 
 [dependencies]
 anyhow = "1.0.65"
@@ -36,4 +40,7 @@ tempfile = "3.3.0"
 tracing = "0.1.37"
 tracing-subscriber = { version = "0.3.16", features = ["env-filter"] }
 tracing-tree = "0.2.2"
+tree-sitter = "0.20.10"
+tree-sitter-edit = "0.3.0"
+tree-sitter-rust = "0.20.4"
 walkdir = "2.3.2"

src/dylib_flag.rs

@@ -32,7 +32,7 @@ impl FromStr for RustFunction {
 fn wrap_func_body(func: &str) -> Result<String> {
     let closure = syn::parse_str::<syn::ExprClosure>(func).context("invalid rust syntax")?;
 
-    let syn_file = syn::parse_quote! {
+    let file = quote::quote! {
         #[repr(C)]
         pub struct __RawOutput {
             out_ptr: *const u8,
@@ -80,7 +80,7 @@ fn wrap_func_body(func: &str) -> Result<String> {
         }
     };
 
-    crate::formatting::format(syn_file)
+    Ok(file.to_string())
 }
 
 impl RustFunction {

src/formatting.rs

@@ -1,12 +0,0 @@
-use std::collections::HashMap;
-
-use anyhow::Context;
-use genemichaels::FormatConfig;
-
-pub fn format(file: syn::File) -> anyhow::Result<String> {
-    Ok(
-        genemichaels::format_ast(file, &FormatConfig::default(), HashMap::new())
-            .context("formatting source file")?
-            .rendered,
-    )
-}

src/lib.rs

@@ -9,7 +9,7 @@ use std::{
 
 mod build;
 mod dylib_flag;
-mod formatting;
+mod tree_sitter;
 mod passes;
 mod processor;
 

src/passes/field_deleter.rs

@@ -1,7 +1,7 @@
 use quote::ToTokens;
 use syn::{visit_mut::VisitMut, Fields};
 
-use crate::processor::{tracking, Pass, PassController, ProcessState, SourceFile};
+use crate::processor::{tracking, Pass, PassController, ProcessState, SourceFile, MinimizeEdit};
 
 struct Visitor<'a> {
     current_path: Vec<String>,
@@ -75,6 +75,17 @@ impl Pass for FieldDeleter {
         visitor.process_state
     }
 
+    fn edits_for_node(&mut self, node: tree_sitter::Node, _edits: &mut Vec<MinimizeEdit>) {
+        match node.kind() {
+            // Braced structs
+            "field_declaration_list" => {}
+            // Tuple structs
+            "ordered_field_declaration_list" => {}
+            _ => {}
+        }
+        
+    }
+
     fn name(&self) -> &'static str {
         "field-deleter"
     }

src/passes/privatize.rs

@@ -1,52 +1,18 @@
-use quote::ToTokens;
+use tree_sitter_edit::NodeId;
-use syn::{parse_quote, visit_mut::VisitMut, Visibility};
 
-use crate::processor::{tracking, Pass, PassController, ProcessState, SourceFile};
+use crate::processor::{MinimizeEdit, MinimizeEditKind, Pass};
-
-struct Visitor<'a> {
-    pub_crate: Visibility,
-    process_state: ProcessState,
-    current_path: Vec<String>,
-    checker: &'a mut PassController,
-}
-
-impl<'a> Visitor<'a> {
-    fn new(checker: &'a mut PassController) -> Self {
-        Self {
-            process_state: ProcessState::NoChange,
-            pub_crate: parse_quote! { pub(crate) },
-            current_path: Vec::new(),
-            checker,
-        }
-    }
-}
-
-impl VisitMut for Visitor<'_> {
-    fn visit_visibility_mut(&mut self, vis: &mut Visibility) {
-        if let Visibility::Public(_) = vis {
-            if self.checker.can_process(&self.current_path) {
-                self.process_state = ProcessState::Changed;
-                *vis = self.pub_crate.clone();
-            }
-        }
-    }
-
-    tracking!();
-}
 
 #[derive(Default)]
 pub struct Privatize {}
 
 impl Pass for Privatize {
-    fn process_file(
+    fn edits_for_node(&mut self, node: tree_sitter::Node, edits: &mut Vec<MinimizeEdit>) {
-        &mut self,
+        if node.kind() == "visibility_modifier" {
-        krate: &mut syn::File,
+            edits.push(MinimizeEdit {
-        _: &SourceFile,
+                node_id: NodeId::new(&node),
-        checker: &mut PassController,
+                kind: MinimizeEditKind::DeleteNode,
-    ) -> ProcessState {
+            });
-        let mut visitor = Visitor::new(checker);
+        }
-        visitor.visit_file_mut(krate);
-        visitor.process_state
     }
 
     fn name(&self) -> &'static str {

src/processor/checker.rs

@@ -4,6 +4,8 @@ use crate::Options;
 
 use self::worklist::Worklist;
 
+use super::MinimizeEdit;
+
 #[derive(Clone, PartialEq, Eq, Hash, PartialOrd, Ord)]
 struct AstPath(Vec<String>);
 
@@ -31,22 +33,18 @@ pub(crate) struct PassController {
 /// The current state of the bisection.
 #[derive(Debug)]
 enum PassControllerState {
-    /// Initially, we have a bunch of candidates (minimization sites) that could be applied.
-    /// We collect them in the initial application of the pass where we try to apply all candiates.
-    /// If that works, great! We're done. But often it doesn't and we enter the next stage.
-    InitialCollection { candidates: Vec<AstPath> },
     /// After applying all candidates fails, we know that we have a few bad candidates.
     /// Now our job is to apply all the good candidates as efficiently as possible.
     Bisecting {
         /// These candidates could be applied successfully while still reproducing the issue.
         /// They are now on disk and will be included in all subsequent runs.
         /// This is only used for debugging, we could also just throw them away.
-        committed: BTreeSet<AstPath>,
+        committed: BTreeSet<MinimizeEdit>,
         /// These candidates failed in isolation and are therefore bad.
         /// This is only used for debugging, we could also just throw them away.
-        failed: BTreeSet<AstPath>,
+        failed: BTreeSet<MinimizeEdit>,
         /// The set of candidates that we want to apply in this iteration.
-        current: BTreeSet<AstPath>,
+        current: Vec<MinimizeEdit>,
         /// The list of `current`s that we want to try in the future.
         worklist: Worklist,
     },
@@ -55,34 +53,37 @@ enum PassControllerState {
 }
 
 mod worklist {
-    use super::AstPath;
+    use crate::processor::MinimizeEdit;
 
     /// A worklist that ensures that the inner list is never empty.
     #[derive(Debug)]
-    pub(super) struct Worklist(Vec<Vec<AstPath>>);
+    pub(super) struct Worklist(Vec<Vec<MinimizeEdit>>);
 
     impl Worklist {
         pub(super) fn new() -> Self {
             Self(Vec::new())
         }
 
-        pub(super) fn push(&mut self, next: Vec<AstPath>) {
+        pub(super) fn push(&mut self, next: Vec<MinimizeEdit>) {
             if !next.is_empty() {
                 self.0.push(next);
             }
         }
 
-        pub(super) fn pop(&mut self) -> Option<Vec<AstPath>> {
+        pub(super) fn pop(&mut self) -> Option<Vec<MinimizeEdit>> {
             self.0.pop()
         }
     }
 }
 
 impl PassController {
-    pub fn new(options: Options) -> Self {
+    pub fn new(options: Options, edits: Vec<MinimizeEdit>) -> Self {
         Self {
-            state: PassControllerState::InitialCollection {
+            state: PassControllerState::Bisecting {
-                candidates: Vec::new(),
+                committed: BTreeSet::new(),
+                failed: BTreeSet::new(),
+                current: edits,
+                worklist: Worklist::new(),
             },
             options,
         }
@@ -90,9 +91,6 @@ impl PassController {
 
     pub fn reproduces(&mut self) {
         match &mut self.state {
-            PassControllerState::InitialCollection { .. } => {
-                self.state = PassControllerState::Success;
-            }
             PassControllerState::Bisecting {
                 committed,
                 failed: _,
@@ -110,20 +108,6 @@ impl PassController {
     /// The changes did not reproduce the regression. Bisect further.
     pub fn does_not_reproduce(&mut self) {
         match &mut self.state {
-            PassControllerState::InitialCollection { candidates } => {
-                // Applying them all was too much, let's bisect!
-                let (current, first_worklist_item) = split_owned(mem::take(candidates));
-
-                let mut worklist = Worklist::new();
-                worklist.push(first_worklist_item);
-
-                self.state = PassControllerState::Bisecting {
-                    committed: BTreeSet::new(),
-                    failed: BTreeSet::new(),
-                    current,
-                    worklist,
-                };
-            }
             PassControllerState::Bisecting {
                 committed,
                 failed,
@@ -158,15 +142,9 @@ impl PassController {
     /// The pass did not apply any changes. We're done.
     pub fn no_change(&mut self) {
         match &self.state {
-            PassControllerState::InitialCollection { candidates } => {
-                assert!(
-                    candidates.is_empty(),
-                    "No change but received candidates. The responsible pass does not seem to track the ProcessState correctly: {candidates:?}"
-                );
-                self.state = PassControllerState::Success;
-            }
             PassControllerState::Bisecting { current, .. } => {
-                unreachable!("Pass said it didn't change anything in the bisection phase, nils forgot what this means: {current:?}");
+                assert!(current.is_empty(), "there are edits available and yet nothing changed, that's nonsense, there's a bug somewhere (i dont know where)");
+                self.state = PassControllerState::Success;
             }
             PassControllerState::Success { .. } => {}
         }
@@ -174,21 +152,19 @@ impl PassController {
 
     pub fn is_finished(&mut self) -> bool {
         match &mut self.state {
-            PassControllerState::InitialCollection { .. } => false,
             PassControllerState::Bisecting { .. } => false,
             PassControllerState::Success { .. } => true,
         }
     }
 
-    /// Checks whether a pass may apply the changes for a minimization site.
+    pub fn can_process(&mut self, _: &[String]) -> bool {
-    pub fn can_process(&mut self, path: &[String]) -> bool {
+        false
-        match &mut self.state {
-            PassControllerState::InitialCollection { candidates } => {
-                // For the initial collection, we collect the candidate and apply them all.
-                candidates.push(AstPath(path.to_owned()));
-                true
     }
-            PassControllerState::Bisecting { current, .. } => current.contains(path),
+
+    /// Checks whether a pass may apply the changes for a minimization site.
+    pub fn current_work_items(&mut self) -> &[MinimizeEdit] {
+        match &mut self.state {
+            PassControllerState::Bisecting { current, .. } => current,
             PassControllerState::Success { .. } => {
                 unreachable!("Processed further after success");
             }

src/processor/files.rs

@@ -3,6 +3,8 @@ use std::{fs, path::Path};
 
 pub(crate) use self::file::SourceFile;
 
+use super::MinimizeEdit;
+
 mod file {
     use anyhow::{Context, Result};
     use std::{
@@ -10,6 +12,8 @@ mod file {
         path::{Path, PathBuf},
     };
 
+    use crate::processor::MinimizeEdit;
+
     use super::{Changes, FileChange};
 
     /// The representation of a source file, with the cached AST.
@@ -19,34 +23,59 @@ mod file {
     pub(crate) struct SourceFile {
         path: PathBuf,
         content_str: RefCell<String>,
-        content: RefCell<syn::File>,
+        content: RefCell<tree_sitter::Tree>,
     }
 
     impl SourceFile {
         pub(crate) fn open(path: PathBuf) -> Result<Self> {
             let string = std::fs::read_to_string(&path)
                 .with_context(|| format!("reading file {}", path.display()))?;
-            let content = syn::parse_file(&string)
+
-                .with_context(|| format!("parsing file {}", path.display()))?;
+            let content_ts = crate::tree_sitter::parse(&string)
+                .with_context(|| format!("parsing file {path:?}"))?;
+
             Ok(SourceFile {
                 path,
                 content_str: RefCell::new(string),
-                content: RefCell::new(content),
+                content: RefCell::new(content_ts),
             })
         }
 
-        pub(crate) fn write(&self, new: syn::File) -> Result<()> {
+        pub(crate) fn write(&self, new: tree_sitter::Tree, edits: &[MinimizeEdit]) -> Result<()> {
-            let string = crate::formatting::format(new.clone())?;
+            let string = crate::tree_sitter::apply_edits(new, &*self.content_str.borrow(), edits)?;
             std::fs::write(&self.path, &string)
                 .with_context(|| format!("writing file {}", self.path.display()))?;
+
+            let reparsed =
+                crate::tree_sitter::parse(&string).expect("failed to reparse after edit");
+
             *self.content_str.borrow_mut() = string;
-            *self.content.borrow_mut() = new;
+            *self.content.borrow_mut() = reparsed;
             Ok(())
         }
 
         pub(crate) fn path_no_fs_interact(&self) -> &Path {
             &self.path
         }
+
+        pub(crate) fn borrow_tree(&self) -> std::cell::Ref<'_, tree_sitter::Tree> {
+            self.content.borrow()
+        }
+
+        pub(crate) fn try_change<'file, 'change>(
+            &'file self,
+            changes: &'change mut Changes,
+        ) -> Result<FileChange<'file, 'change>> {
+            let path = &self.path;
+            Ok(FileChange {
+                path,
+                source_file: self,
+                changes,
+                has_written_change: false,
+                before_content_str: self.content_str.borrow().clone(),
+                before_content: self.content.borrow().clone(),
+            })
+        }
     }
 
     impl PartialEq for SourceFile {
@@ -68,23 +97,6 @@ mod file {
             write!(f, "{}", self.path.display())
         }
     }
-
-    impl SourceFile {
-        pub(crate) fn try_change<'file, 'change>(
-            &'file self,
-            changes: &'change mut Changes,
-        ) -> Result<FileChange<'file, 'change>> {
-            let path = &self.path;
-            Ok(FileChange {
-                path,
-                source_file: self,
-                changes,
-                has_written_change: false,
-                before_content_str: self.content_str.borrow().clone(),
-                before_content: self.content.borrow().clone(),
-            })
-        }
-    }
 }
 
 #[derive(Default)]
@@ -96,26 +108,26 @@ pub(crate) struct FileChange<'a, 'b> {
     pub(crate) path: &'a Path,
     source_file: &'a SourceFile,
     before_content_str: String,
-    before_content: syn::File,
+    before_content: tree_sitter::Tree,
     changes: &'b mut Changes,
     has_written_change: bool,
 }
 
 impl FileChange<'_, '_> {
-    pub(crate) fn before_content(&self) -> (&str, &syn::File) {
+    pub(crate) fn before_content(&self) -> (&str, &tree_sitter::Tree) {
         (&self.before_content_str, &self.before_content)
     }
 
-    pub(crate) fn write(&mut self, new: syn::File) -> Result<()> {
+    pub(crate) fn write(&mut self, new: tree_sitter::Tree, edits: &[MinimizeEdit]) -> Result<()> {
         self.has_written_change = true;
-        self.source_file.write(new)?;
+        self.source_file.write(new, edits)?;
         Ok(())
     }
 
     pub(crate) fn rollback(mut self) -> Result<()> {
         assert!(self.has_written_change);
         self.has_written_change = false;
-        self.source_file.write(self.before_content.clone())?;
+        self.source_file.write(self.before_content.clone(), &[])?;
         Ok(())
     }
 

src/processor/mod.rs

@@ -5,10 +5,11 @@ mod reaper;
 pub(crate) use self::files::SourceFile;
 use crate::{build::Build, processor::files::Changes, Options};
 use anyhow::{bail, Context, Result};
-use owo_colors::OwoColorize;
 use std::sync::atomic::Ordering;
 use std::sync::Arc;
 use std::{collections::HashSet, ffi::OsStr, fmt::Debug, sync::atomic::AtomicBool};
+use tree_sitter::Node;
+use tree_sitter_edit::NodeId;
 
 pub(crate) use self::checker::PassController;
 
@@ -22,10 +23,14 @@ pub(crate) trait Pass {
     /// before calling the this function on the same file again.
     fn process_file(
         &mut self,
-        krate: &mut syn::File,
+        _krate: &mut syn::File,
-        file: &SourceFile,
+        _file: &SourceFile,
-        checker: &mut PassController,
+        _checker: &mut PassController,
-    ) -> ProcessState;
+    ) -> ProcessState {
+        unimplemented!()
+    }
+
+    fn edits_for_node(&mut self, _node: tree_sitter::Node, _edits: &mut Vec<MinimizeEdit>) {}
 
     fn name(&self) -> &'static str;
 
@@ -50,6 +55,17 @@ pub(crate) enum ProcessState {
     FileInvalidated,
 }
 
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub(crate) struct MinimizeEdit {
+    pub(crate) node_id: NodeId,
+    pub(crate) kind: MinimizeEditKind,
+}
+
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub(crate) enum MinimizeEditKind {
+    DeleteNode,
+}
+
 #[derive(Debug)]
 pub(crate) struct Minimizer {
     files: Vec<SourceFile>,
@@ -173,12 +189,12 @@ impl Minimizer {
         }
     }
 
-    #[instrument(skip(self, pass, invalidated_files, changes), fields(pass = %pass.name()), level = "debug")]
+    #[instrument(skip(self, pass, _invalidated_files, changes), fields(pass = %pass.name()), level = "debug")]
     fn process_file<'file>(
         &self,
         pass: &mut dyn Pass,
         file: &'file SourceFile,
-        invalidated_files: &mut HashSet<&'file SourceFile>,
+        _invalidated_files: &mut HashSet<&'file SourceFile>,
         changes: &mut Changes,
     ) -> Result<()> {
         // The core logic of minimization.
@@ -186,16 +202,34 @@ impl Minimizer {
         // For this, we repeatedly try to apply a pass to a subset of a file until we've exhausted all options.
         // The logic for bisecting down lives in PassController.
 
-        let mut checker = PassController::new(self.options.clone());
+        let mut edits = Vec::new();
+
+        let krate = file.borrow_tree();
+        recursive_walk_node(krate.root_node(), &mut |node| {
+            pass.edits_for_node(node, &mut edits);
+        });
+        drop(krate);
+
+        let mut checker = PassController::new(self.options.clone(), edits);
         loop {
             let mut change = file.try_change(changes)?;
             let (_, krate) = change.before_content();
-            let mut krate = krate.clone();
+            let krate = krate.clone();
-            let has_made_change = pass.process_file(&mut krate, file, &mut checker);
 
-            match has_made_change {
+            let edits = checker.current_work_items();
-                ProcessState::Changed | ProcessState::FileInvalidated => {
+
-                    change.write(krate)?;
+            match edits.len() {
+                0 => {
+                    use owo_colors::OwoColorize;
+                    if self.options.no_color {
+                        info!("{file:?}: After {}: no changes", pass.name());
+                    } else {
+                        info!("{file:?}: After {}: {}", pass.name(), "no changes".yellow());
+                    }
+                    checker.no_change();
+                }
+                1.. => {
+                    change.write(krate, edits)?;
 
                     let after = self.build.build()?;
                     info!("{file:?}: After {}: {after}", pass.name());
@@ -207,18 +241,6 @@ impl Minimizer {
                         change.rollback()?;
                         checker.does_not_reproduce();
                     }
-
-                    if has_made_change == ProcessState::FileInvalidated {
-                        invalidated_files.insert(file);
-                    }
-                }
-                ProcessState::NoChange => {
-                    if self.options.no_color {
-                        info!("{file:?}: After {}: no changes", pass.name());
-                    } else {
-                        info!("{file:?}: After {}: {}", pass.name(), "no changes".yellow());
-                    }
-                    checker.no_change();
                 }
             }
 
@@ -235,6 +257,14 @@ impl Minimizer {
     }
 }
 
+fn recursive_walk_node<'a>(node: Node<'a>, for_each: &mut impl FnMut(Node<'_>)) {
+    for i in 0..node.child_count() {
+        let child = node.child(i).unwrap();
+        for_each(child);
+        recursive_walk_node(child, for_each);
+    }
+}
+
 macro_rules! tracking {
     () => {
         tracking!(visit_item_fn_mut);

src/processor/reaper.rs

@@ -82,8 +82,8 @@ impl Minimizer {
 
             let result =
                 rustfix::apply_suggestions(change.before_content().0, &desired_suggestions)?;
-            let result = syn::parse_file(&result).context("parsing file after rustfix")?;
+            let result = crate::tree_sitter::parse(&result).context("parsing file after rustfix")?;
-            change.write(result)?;
+            change.write(result, &[])?;
 
             let after = self.build.build()?;
 

src/tree_sitter.rs

@@ -0,0 +1,53 @@
+use anyhow::{Context, Result};
+
+use crate::processor::{MinimizeEdit, MinimizeEditKind};
+
+pub fn parse(source: &str) -> Result<tree_sitter::Tree> {
+    let mut parser = tree_sitter::Parser::new();
+    parser
+        .set_language(tree_sitter_rust::language())
+        .context("loading tree sitter rust grammar")?;
+    let content_ts = parser.parse(source, None).context("parsing file")?;
+    Ok(content_ts)
+}
+
+pub fn apply_edits(
+    file: tree_sitter::Tree, // Taking it by value as the old tree should not be used afterwards
+    source: &str,
+    edits: &[MinimizeEdit],
+) -> anyhow::Result<String> {
+    let mut s = Vec::new();
+    tree_sitter_edit::render(&mut s, &file, source.as_bytes(), &MinimizeEditor { edits })
+        .context("printing tree")?;
+
+    Ok(String::from_utf8(s).unwrap())
+}
+
+struct MinimizeEditor<'a> {
+    edits: &'a [MinimizeEdit],
+}
+
+impl tree_sitter_edit::Editor for MinimizeEditor<'_> {
+    fn has_edit(&self, _tree: &tree_sitter::Tree, node: &tree_sitter::Node<'_>) -> bool {
+        self.edits.iter().any(|edit| edit.node_id.is(node))
+    }
+
+    fn edit(
+        &self,
+        _source: &[u8],
+        _tree: &tree_sitter::Tree,
+        node: &tree_sitter::Node<'_>,
+    ) -> Vec<u8> {
+        self.edits
+            .iter()
+            .filter(|edit| edit.node_id.is(node))
+            .find_map(|edit| {
+                Some({
+                    match edit.kind {
+                        MinimizeEditKind::DeleteNode => Vec::new(),
+                    }
+                })
+            })
+            .unwrap()
+    }
+}

testsuite/src/lib.rs

@@ -101,7 +101,7 @@ pub fn full_tests() -> Result<()> {
                 let path = child.path();
 
                 build(&cargo, &path, &regression_checker_path)
-                    .with_context(|| format!("building {:?}", path.file_name().unwrap()))
+                    .with_context(|| format!("test {:?}", path.file_name().unwrap()))
             })
             .collect::<Result<Vec<_>>>()?;
     } else {
@@ -109,7 +109,7 @@ pub fn full_tests() -> Result<()> {
             let path = child.path();
 
             build(&cargo, &path, &regression_checker_path)
-                .with_context(|| format!("building {:?}", path.file_name().unwrap()))?;
+                .with_context(|| format!("test {:?}", path.file_name().unwrap()))?;
         }
     }
 
@@ -159,6 +159,10 @@ fn build(cargo: &Path, path: &Path, regression_checker_path: &Path) -> Result<()
         .canonicalize()
         .context("canonicalizing target/debug/cargo-minimize")?;
 
+    if is_ignored(&proj_dir).context("checking whether the test is ignored")? {
+        return Ok(());
+    }
+
     let start_roots = get_roots(&proj_dir).context("getting initial MINIMIZE-ROOTs")?;
 
     let mut cmd = Command::new(cargo_minimize);
@@ -209,6 +213,12 @@ fn get_required_deleted(path: &Path) -> Result<Vec<String>> {
     grep(path, &REGEX)
 }
 
+fn is_ignored(path: &Path) -> Result<bool> {
+    static REGEX: Lazy<Regex> = Lazy::new(|| Regex::new(r"~IGNORE").unwrap());
+
+    grep(path, &REGEX).map(|v| !v.is_empty())
+}
+
 fn grep(path: &Path, regex: &Regex) -> Result<Vec<String>> {
     let path = path.join("src");
     let mut results = Vec::new();