Deny unreachable-pub

It's very useful when `pub` is equivalent to "this is crate's public
API", let's enforce this!

Ideally, we should enforce it for local `cargo test`, and only during
CI, but that needs https://github.com/rust-lang/cargo/issues/5034.

29 files changed, 148 insertions, 149 deletions

diff --git a/crates/base_db/src/input.rs b/crates/base_db/src/input.rs
index 87f0a0ce5..31907ed98 100644
--- a/crates/base_db/src/input.rs
+++ b/crates/base_db/src/input.rs
@@ -12,9 +12,7 @@ use cfg::CfgOptions;
 use rustc_hash::{FxHashMap, FxHashSet};
 use syntax::SmolStr;
 use tt::TokenExpander;
-use vfs::{file_set::FileSet, VfsPath};
-
-pub use vfs::FileId;
+use vfs::{file_set::FileSet, FileId, VfsPath};
 
 /// Files are grouped into source roots. A source root is a directory on the
 /// file systems which is watched for changes. Typically it corresponds to a
diff --git a/crates/base_db/src/lib.rs b/crates/base_db/src/lib.rs
index 0804202d6..ce75a5337 100644
--- a/crates/base_db/src/lib.rs
+++ b/crates/base_db/src/lib.rs
@@ -14,11 +14,11 @@ pub use crate::{
     change::Change,
     input::{
         CrateData, CrateDisplayName, CrateGraph, CrateId, CrateName, Dependency, Edition, Env,
-        FileId, ProcMacroId, SourceRoot, SourceRootId,
+        ProcMacroId, SourceRoot, SourceRootId,
     },
 };
 pub use salsa;
-pub use vfs::{file_set::FileSet, VfsPath};
+pub use vfs::{file_set::FileSet, FileId, VfsPath};
 
 #[macro_export]
 macro_rules! impl_intern_key {
diff --git a/crates/hir_def/src/body/lower.rs b/crates/hir_def/src/body/lower.rs
index ddc267b83..1deaa90f2 100644
--- a/crates/hir_def/src/body/lower.rs
+++ b/crates/hir_def/src/body/lower.rs
@@ -45,14 +45,14 @@ pub(crate) struct LowerCtx {
 }
 
 impl LowerCtx {
-    pub fn new(db: &dyn DefDatabase, file_id: HirFileId) -> Self {
+    pub(crate) fn new(db: &dyn DefDatabase, file_id: HirFileId) -> Self {
         LowerCtx { hygiene: Hygiene::new(db.upcast(), file_id) }
     }
-    pub fn with_hygiene(hygiene: &Hygiene) -> Self {
+    pub(crate) fn with_hygiene(hygiene: &Hygiene) -> Self {
         LowerCtx { hygiene: hygiene.clone() }
     }
 
-    pub fn lower_path(&self, ast: ast::Path) -> Option<Path> {
+    pub(crate) fn lower_path(&self, ast: ast::Path) -> Option<Path> {
         Path::from_src(ast, &self.hygiene)
     }
 }
diff --git a/crates/hir_def/src/lib.rs b/crates/hir_def/src/lib.rs
index f24a1dd77..1b22d1eec 100644
--- a/crates/hir_def/src/lib.rs
+++ b/crates/hir_def/src/lib.rs
@@ -486,12 +486,12 @@ impl AsMacroCall for InFile<&ast::MacroCall> {
 /// Helper wrapper for `AstId` with `ModPath`
 #[derive(Clone, Debug, Eq, PartialEq)]
 struct AstIdWithPath<T: ast::AstNode> {
-    pub ast_id: AstId<T>,
-    pub path: path::ModPath,
+    ast_id: AstId<T>,
+    path: path::ModPath,
 }
 
 impl<T: ast::AstNode> AstIdWithPath<T> {
-    pub fn new(file_id: HirFileId, ast_id: FileAstId<T>, path: path::ModPath) -> AstIdWithPath<T> {
+    fn new(file_id: HirFileId, ast_id: FileAstId<T>, path: path::ModPath) -> AstIdWithPath<T> {
         AstIdWithPath { ast_id: AstId::new(file_id, ast_id), path }
     }
 }
diff --git a/crates/hir_def/src/nameres/collector.rs b/crates/hir_def/src/nameres/collector.rs
index 1ff45d244..59b6644c3 100644
--- a/crates/hir_def/src/nameres/collector.rs
+++ b/crates/hir_def/src/nameres/collector.rs
@@ -122,13 +122,13 @@ enum ImportSource {
 
 #[derive(Clone, Debug, Eq, PartialEq)]
 struct Import {
-    pub path: ModPath,
-    pub alias: Option<ImportAlias>,
-    pub visibility: RawVisibility,
-    pub is_glob: bool,
-    pub is_prelude: bool,
-    pub is_extern_crate: bool,
-    pub is_macro_use: bool,
+    path: ModPath,
+    alias: Option<ImportAlias>,
+    visibility: RawVisibility,
+    is_glob: bool,
+    is_prelude: bool,
+    is_extern_crate: bool,
+    is_macro_use: bool,
     source: ImportSource,
 }
 
diff --git a/crates/hir_def/src/test_db.rs b/crates/hir_def/src/test_db.rs
index 2b36c824a..00fe711fe 100644
--- a/crates/hir_def/src/test_db.rs
+++ b/crates/hir_def/src/test_db.rs
@@ -25,7 +25,7 @@ use crate::{db::DefDatabase, ModuleDefId};
     crate::db::DefDatabaseStorage
 )]
 #[derive(Default)]
-pub struct TestDB {
+pub(crate) struct TestDB {
     storage: salsa::Storage<TestDB>,
     events: Mutex<Option<Vec<salsa::Event>>>,
 }
@@ -72,7 +72,7 @@ impl FileLoader for TestDB {
 }
 
 impl TestDB {
-    pub fn module_for_file(&self, file_id: FileId) -> crate::ModuleId {
+    pub(crate) fn module_for_file(&self, file_id: FileId) -> crate::ModuleId {
         for &krate in self.relevant_crates(file_id).iter() {
             let crate_def_map = self.crate_def_map(krate);
             for (local_id, data) in crate_def_map.modules.iter() {
@@ -84,13 +84,13 @@ impl TestDB {
         panic!("Can't find module for file")
     }
 
-    pub fn log(&self, f: impl FnOnce()) -> Vec<salsa::Event> {
+    pub(crate) fn log(&self, f: impl FnOnce()) -> Vec<salsa::Event> {
         *self.events.lock().unwrap() = Some(Vec::new());
         f();
         self.events.lock().unwrap().take().unwrap()
     }
 
-    pub fn log_executed(&self, f: impl FnOnce()) -> Vec<String> {
+    pub(crate) fn log_executed(&self, f: impl FnOnce()) -> Vec<String> {
         let events = self.log(f);
         events
             .into_iter()
@@ -105,7 +105,7 @@ impl TestDB {
             .collect()
     }
 
-    pub fn extract_annotations(&self) -> FxHashMap<FileId, Vec<(TextRange, String)>> {
+    pub(crate) fn extract_annotations(&self) -> FxHashMap<FileId, Vec<(TextRange, String)>> {
         let mut files = Vec::new();
         let crate_graph = self.crate_graph();
         for krate in crate_graph.iter() {
@@ -129,7 +129,7 @@ impl TestDB {
             .collect()
     }
 
-    pub fn diagnostics<F: FnMut(&dyn Diagnostic)>(&self, mut cb: F) {
+    pub(crate) fn diagnostics<F: FnMut(&dyn Diagnostic)>(&self, mut cb: F) {
         let crate_graph = self.crate_graph();
         for krate in crate_graph.iter() {
             let crate_def_map = self.crate_def_map(krate);
@@ -148,7 +148,7 @@ impl TestDB {
         }
     }
 
-    pub fn check_diagnostics(&self) {
+    pub(crate) fn check_diagnostics(&self) {
         let db: &TestDB = self;
         let annotations = db.extract_annotations();
         assert!(!annotations.is_empty());
diff --git a/crates/hir_ty/src/diagnostics/decl_check/case_conv.rs b/crates/hir_ty/src/diagnostics/decl_check/case_conv.rs
index b0144a289..14e4d92f0 100644
--- a/crates/hir_ty/src/diagnostics/decl_check/case_conv.rs
+++ b/crates/hir_ty/src/diagnostics/decl_check/case_conv.rs
@@ -6,7 +6,7 @@
 
 /// Converts an identifier to an UpperCamelCase form.
 /// Returns `None` if the string is already is UpperCamelCase.
-pub fn to_camel_case(ident: &str) -> Option<String> {
+pub(crate) fn to_camel_case(ident: &str) -> Option<String> {
     if is_camel_case(ident) {
         return None;
     }
@@ -59,7 +59,7 @@ pub fn to_camel_case(ident: &str) -> Option<String> {
 
 /// Converts an identifier to a lower_snake_case form.
 /// Returns `None` if the string is already in lower_snake_case.
-pub fn to_lower_snake_case(ident: &str) -> Option<String> {
+pub(crate) fn to_lower_snake_case(ident: &str) -> Option<String> {
     if is_lower_snake_case(ident) {
         return None;
     } else if is_upper_snake_case(ident) {
@@ -71,7 +71,7 @@ pub fn to_lower_snake_case(ident: &str) -> Option<String> {
 
 /// Converts an identifier to an UPPER_SNAKE_CASE form.
 /// Returns `None` if the string is already is UPPER_SNAKE_CASE.
-pub fn to_upper_snake_case(ident: &str) -> Option<String> {
+pub(crate) fn to_upper_snake_case(ident: &str) -> Option<String> {
     if is_upper_snake_case(ident) {
         return None;
     } else if is_lower_snake_case(ident) {
diff --git a/crates/hir_ty/src/diagnostics/expr.rs b/crates/hir_ty/src/diagnostics/expr.rs
index 278a4b947..434b19354 100644
--- a/crates/hir_ty/src/diagnostics/expr.rs
+++ b/crates/hir_ty/src/diagnostics/expr.rs
@@ -17,17 +17,10 @@ use crate::{
     ApplicationTy, InferenceResult, Ty, TypeCtor,
 };
 
-pub use hir_def::{
-    body::{
-        scope::{ExprScopes, ScopeEntry, ScopeId},
-        Body, BodySourceMap, ExprPtr, ExprSource, PatPtr, PatSource,
-    },
-    expr::{
-        ArithOp, Array, BinaryOp, BindingAnnotation, CmpOp, Expr, ExprId, Literal, LogicOp,
-        MatchArm, Ordering, Pat, PatId, RecordFieldPat, RecordLitField, Statement, UnaryOp,
-    },
-    src::HasSource,
-    LocalFieldId, Lookup, VariantId,
+pub(crate) use hir_def::{
+    body::{Body, BodySourceMap},
+    expr::{Expr, ExprId, MatchArm, Pat, PatId},
+    LocalFieldId, VariantId,
 };
 
 pub(super) struct ExprValidator<'a, 'b: 'a> {
diff --git a/crates/hir_ty/src/diagnostics/unsafe_check.rs b/crates/hir_ty/src/diagnostics/unsafe_check.rs
index 2da9688ca..6dc862826 100644
--- a/crates/hir_ty/src/diagnostics/unsafe_check.rs
+++ b/crates/hir_ty/src/diagnostics/unsafe_check.rs
@@ -59,12 +59,12 @@ impl<'a, 'b> UnsafeValidator<'a, 'b> {
     }
 }
 
-pub struct UnsafeExpr {
-    pub expr: ExprId,
-    pub inside_unsafe_block: bool,
+pub(crate) struct UnsafeExpr {
+    pub(crate) expr: ExprId,
+    pub(crate) inside_unsafe_block: bool,
 }
 
-pub fn unsafe_expressions(
+pub(crate) fn unsafe_expressions(
     db: &dyn HirDatabase,
     infer: &InferenceResult,
     def: DefWithBodyId,
diff --git a/crates/hir_ty/src/infer.rs b/crates/hir_ty/src/infer.rs
index 644ebd42d..f4c1fa2f2 100644
--- a/crates/hir_ty/src/infer.rs
+++ b/crates/hir_ty/src/infer.rs
@@ -214,9 +214,9 @@ struct InferenceContext<'a> {
 
 #[derive(Clone, Debug)]
 struct BreakableContext {
-    pub may_break: bool,
-    pub break_ty: Ty,
-    pub label: Option<name::Name>,
+    may_break: bool,
+    break_ty: Ty,
+    label: Option<name::Name>,
 }
 
 fn find_breakable<'c>(
diff --git a/crates/hir_ty/src/infer/expr.rs b/crates/hir_ty/src/infer/expr.rs
index 8ac4cf89a..605951b10 100644
--- a/crates/hir_ty/src/infer/expr.rs
+++ b/crates/hir_ty/src/infer/expr.rs
@@ -107,7 +107,7 @@ impl<'a> InferenceContext<'a> {
         }
     }
 
-    pub fn callable_sig(&mut self, ty: &Ty, num_args: usize) -> Option<(Vec<Ty>, Ty)> {
+    pub(crate) fn callable_sig(&mut self, ty: &Ty, num_args: usize) -> Option<(Vec<Ty>, Ty)> {
         match ty.callable_sig(self.db) {
             Some(sig) => Some((sig.params().to_vec(), sig.ret().clone())),
             None => self.callable_sig_from_fn_trait(ty, num_args),
diff --git a/crates/hir_ty/src/infer/unify.rs b/crates/hir_ty/src/infer/unify.rs
index 2e895d911..2406a7361 100644
--- a/crates/hir_ty/src/infer/unify.rs
+++ b/crates/hir_ty/src/infer/unify.rs
@@ -127,7 +127,7 @@ where
 }
 
 impl<T> Canonicalized<T> {
-    pub fn decanonicalize_ty(&self, mut ty: Ty) -> Ty {
+    pub(super) fn decanonicalize_ty(&self, mut ty: Ty) -> Ty {
         ty.walk_mut_binders(
             &mut |ty, binders| {
                 if let &mut Ty::Bound(bound) = ty {
@@ -141,7 +141,11 @@ impl<T> Canonicalized<T> {
         ty
     }
 
-    pub fn apply_solution(&self, ctx: &mut InferenceContext<'_>, solution: Canonical<Substs>) {
+    pub(super) fn apply_solution(
+        &self,
+        ctx: &mut InferenceContext<'_>,
+        solution: Canonical<Substs>,
+    ) {
         // the solution may contain new variables, which we need to convert to new inference vars
         let new_vars = Substs(
             solution
@@ -164,7 +168,7 @@ impl<T> Canonicalized<T> {
     }
 }
 
-pub fn unify(tys: &Canonical<(Ty, Ty)>) -> Option<Substs> {
+pub(crate) fn unify(tys: &Canonical<(Ty, Ty)>) -> Option<Substs> {
     let mut table = InferenceTable::new();
     let vars = Substs(
         tys.kinds
@@ -199,41 +203,46 @@ pub(crate) struct InferenceTable {
 }
 
 impl InferenceTable {
-    pub fn new() -> Self {
+    pub(crate) fn new() -> Self {
         InferenceTable { var_unification_table: InPlaceUnificationTable::new() }
     }
 
-    pub fn new_type_var(&mut self) -> Ty {
+    pub(crate) fn new_type_var(&mut self) -> Ty {
         Ty::Infer(InferTy::TypeVar(self.var_unification_table.new_key(TypeVarValue::Unknown)))
     }
 
-    pub fn new_integer_var(&mut self) -> Ty {
+    pub(crate) fn new_integer_var(&mut self) -> Ty {
         Ty::Infer(InferTy::IntVar(self.var_unification_table.new_key(TypeVarValue::Unknown)))
     }
 
-    pub fn new_float_var(&mut self) -> Ty {
+    pub(crate) fn new_float_var(&mut self) -> Ty {
         Ty::Infer(InferTy::FloatVar(self.var_unification_table.new_key(TypeVarValue::Unknown)))
     }
 
-    pub fn new_maybe_never_type_var(&mut self) -> Ty {
+    pub(crate) fn new_maybe_never_type_var(&mut self) -> Ty {
         Ty::Infer(InferTy::MaybeNeverTypeVar(
             self.var_unification_table.new_key(TypeVarValue::Unknown),
         ))
     }
 
-    pub fn resolve_ty_completely(&mut self, ty: Ty) -> Ty {
+    pub(crate) fn resolve_ty_completely(&mut self, ty: Ty) -> Ty {
         self.resolve_ty_completely_inner(&mut Vec::new(), ty)
     }
 
-    pub fn resolve_ty_as_possible(&mut self, ty: Ty) -> Ty {
+    pub(crate) fn resolve_ty_as_possible(&mut self, ty: Ty) -> Ty {
         self.resolve_ty_as_possible_inner(&mut Vec::new(), ty)
     }
 
-    pub fn unify(&mut self, ty1: &Ty, ty2: &Ty) -> bool {
+    pub(crate) fn unify(&mut self, ty1: &Ty, ty2: &Ty) -> bool {
         self.unify_inner(ty1, ty2, 0)
     }
 
-    pub fn unify_substs(&mut self, substs1: &Substs, substs2: &Substs, depth: usize) -> bool {
+    pub(crate) fn unify_substs(
+        &mut self,
+        substs1: &Substs,
+        substs2: &Substs,
+        depth: usize,
+    ) -> bool {
         substs1.0.iter().zip(substs2.0.iter()).all(|(t1, t2)| self.unify_inner(t1, t2, depth))
     }
 
@@ -331,7 +340,7 @@ impl InferenceTable {
 
     /// If `ty` is a type variable with known type, returns that type;
     /// otherwise, return ty.
-    pub fn resolve_ty_shallow<'b>(&mut self, ty: &'b Ty) -> Cow<'b, Ty> {
+    pub(crate) fn resolve_ty_shallow<'b>(&mut self, ty: &'b Ty) -> Cow<'b, Ty> {
         let mut ty = Cow::Borrowed(ty);
         // The type variable could resolve to a int/float variable. Hence try
         // resolving up to three times; each type of variable shouldn't occur
diff --git a/crates/hir_ty/src/lib.rs b/crates/hir_ty/src/lib.rs
index 768d95eff..5a8c97198 100644
--- a/crates/hir_ty/src/lib.rs
+++ b/crates/hir_ty/src/lib.rs
@@ -1,6 +1,5 @@
 //! The type system. We currently use this to infer types for completion, hover
 //! information and various assists.
-
 #[allow(unused)]
 macro_rules! eprintln {
     ($($tt:tt)*) => { stdx::eprintln!($($tt)*) };
@@ -1115,5 +1114,5 @@ pub struct ReturnTypeImplTraits {
 
 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
 pub(crate) struct ReturnTypeImplTrait {
-    pub bounds: Binders<Vec<GenericPredicate>>,
+    pub(crate) bounds: Binders<Vec<GenericPredicate>>,
 }
diff --git a/crates/hir_ty/src/test_db.rs b/crates/hir_ty/src/test_db.rs
index 15b8435e9..22254b765 100644
--- a/crates/hir_ty/src/test_db.rs
+++ b/crates/hir_ty/src/test_db.rs
@@ -21,7 +21,7 @@ use test_utils::extract_annotations;
     crate::db::HirDatabaseStorage
 )]
 #[derive(Default)]
-pub struct TestDB {
+pub(crate) struct TestDB {
     storage: salsa::Storage<TestDB>,
     events: Mutex<Option<Vec<salsa::Event>>>,
 }
@@ -113,13 +113,13 @@ impl TestDB {
 }
 
 impl TestDB {
-    pub fn log(&self, f: impl FnOnce()) -> Vec<salsa::Event> {
+    pub(crate) fn log(&self, f: impl FnOnce()) -> Vec<salsa::Event> {
         *self.events.lock().unwrap() = Some(Vec::new());
         f();
         self.events.lock().unwrap().take().unwrap()
     }
 
-    pub fn log_executed(&self, f: impl FnOnce()) -> Vec<String> {
+    pub(crate) fn log_executed(&self, f: impl FnOnce()) -> Vec<String> {
         let events = self.log(f);
         events
             .into_iter()
diff --git a/crates/hir_ty/src/traits/chalk/tls.rs b/crates/hir_ty/src/traits/chalk/tls.rs
index 3c9766550..75b16172e 100644
--- a/crates/hir_ty/src/traits/chalk/tls.rs
+++ b/crates/hir_ty/src/traits/chalk/tls.rs
@@ -8,12 +8,12 @@ use super::{from_chalk, Interner, TypeAliasAsAssocType};
 use crate::{db::HirDatabase, CallableDefId};
 use hir_def::{AdtId, AssocContainerId, Lookup, TypeAliasId};
 
-pub use unsafe_tls::{set_current_program, with_current_program};
+pub(crate) use unsafe_tls::{set_current_program, with_current_program};
 
-pub struct DebugContext<'a>(&'a dyn HirDatabase);
+pub(crate) struct DebugContext<'a>(&'a dyn HirDatabase);
 
 impl DebugContext<'_> {
-    pub fn debug_struct_id(
+    pub(crate) fn debug_struct_id(
         &self,
         id: super::AdtId,
         f: &mut fmt::Formatter<'_>,
@@ -26,7 +26,7 @@ impl DebugContext<'_> {
         write!(f, "{}", name)
     }
 
-    pub fn debug_trait_id(
+    pub(crate) fn debug_trait_id(
         &self,
         id: super::TraitId,
         fmt: &mut fmt::Formatter<'_>,
@@ -36,7 +36,7 @@ impl DebugContext<'_> {
         write!(fmt, "{}", trait_data.name)
     }
 
-    pub fn debug_assoc_type_id(
+    pub(crate) fn debug_assoc_type_id(
         &self,
         id: super::AssocTypeId,
         fmt: &mut fmt::Formatter<'_>,
@@ -51,7 +51,7 @@ impl DebugContext<'_> {
         write!(fmt, "{}::{}", trait_data.name, type_alias_data.name)
     }
 
-    pub fn debug_opaque_ty_id(
+    pub(crate) fn debug_opaque_ty_id(
         &self,
         opaque_ty_id: chalk_ir::OpaqueTyId<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -59,7 +59,7 @@ impl DebugContext<'_> {
         fmt.debug_struct("OpaqueTyId").field("index", &opaque_ty_id.0).finish()
     }
 
-    pub fn debug_alias(
+    pub(crate) fn debug_alias(
         &self,
         alias_ty: &AliasTy<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -70,7 +70,7 @@ impl DebugContext<'_> {
         }
     }
 
-    pub fn debug_projection_ty(
+    pub(crate) fn debug_projection_ty(
         &self,
         projection_ty: &chalk_ir::ProjectionTy<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -95,7 +95,7 @@ impl DebugContext<'_> {
         write!(fmt, ">::{}", type_alias_data.name)
     }
 
-    pub fn debug_opaque_ty(
+    pub(crate) fn debug_opaque_ty(
         &self,
         opaque_ty: &chalk_ir::OpaqueTy<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -103,7 +103,7 @@ impl DebugContext<'_> {
         write!(fmt, "{:?}", opaque_ty.opaque_ty_id)
     }
 
-    pub fn debug_ty(
+    pub(crate) fn debug_ty(
         &self,
         ty: &chalk_ir::Ty<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -111,7 +111,7 @@ impl DebugContext<'_> {
         write!(fmt, "{:?}", ty.data(&Interner))
     }
 
-    pub fn debug_lifetime(
+    pub(crate) fn debug_lifetime(
         &self,
         lifetime: &Lifetime<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -119,7 +119,7 @@ impl DebugContext<'_> {
         write!(fmt, "{:?}", lifetime.data(&Interner))
     }
 
-    pub fn debug_generic_arg(
+    pub(crate) fn debug_generic_arg(
         &self,
         parameter: &GenericArg<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -127,7 +127,7 @@ impl DebugContext<'_> {
         write!(fmt, "{:?}", parameter.data(&Interner).inner_debug())
     }
 
-    pub fn debug_goal(
+    pub(crate) fn debug_goal(
         &self,
         goal: &Goal<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -136,7 +136,7 @@ impl DebugContext<'_> {
         write!(fmt, "{:?}", goal_data)
     }
 
-    pub fn debug_goals(
+    pub(crate) fn debug_goals(
         &self,
         goals: &Goals<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -144,7 +144,7 @@ impl DebugContext<'_> {
         write!(fmt, "{:?}", goals.debug(&Interner))
     }
 
-    pub fn debug_program_clause_implication(
+    pub(crate) fn debug_program_clause_implication(
         &self,
         pci: &ProgramClauseImplication<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -152,7 +152,7 @@ impl DebugContext<'_> {
         write!(fmt, "{:?}", pci.debug(&Interner))
     }
 
-    pub fn debug_substitution(
+    pub(crate) fn debug_substitution(
         &self,
         substitution: &chalk_ir::Substitution<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -160,7 +160,7 @@ impl DebugContext<'_> {
         write!(fmt, "{:?}", substitution.debug(&Interner))
     }
 
-    pub fn debug_separator_trait_ref(
+    pub(crate) fn debug_separator_trait_ref(
         &self,
         separator_trait_ref: &chalk_ir::SeparatorTraitRef<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -168,7 +168,7 @@ impl DebugContext<'_> {
         write!(fmt, "{:?}", separator_trait_ref.debug(&Interner))
     }
 
-    pub fn debug_fn_def_id(
+    pub(crate) fn debug_fn_def_id(
         &self,
         fn_def_id: chalk_ir::FnDefId<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -190,7 +190,7 @@ impl DebugContext<'_> {
         }
     }
 
-    pub fn debug_const(
+    pub(crate) fn debug_const(
         &self,
         _constant: &chalk_ir::Const<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -198,42 +198,42 @@ impl DebugContext<'_> {
         write!(fmt, "const")
     }
 
-    pub fn debug_variable_kinds(
+    pub(crate) fn debug_variable_kinds(
         &self,
         variable_kinds: &chalk_ir::VariableKinds<Interner>,
         fmt: &mut fmt::Formatter<'_>,
     ) -> fmt::Result {
         write!(fmt, "{:?}", variable_kinds.as_slice(&Interner))
     }
-    pub fn debug_variable_kinds_with_angles(
+    pub(crate) fn debug_variable_kinds_with_angles(
         &self,
         variable_kinds: &chalk_ir::VariableKinds<Interner>,
         fmt: &mut fmt::Formatter<'_>,
     ) -> fmt::Result {
         write!(fmt, "{:?}", variable_kinds.inner_debug(&Interner))
     }
-    pub fn debug_canonical_var_kinds(
+    pub(crate) fn debug_canonical_var_kinds(
         &self,
         canonical_var_kinds: &chalk_ir::CanonicalVarKinds<Interner>,
         fmt: &mut fmt::Formatter<'_>,
     ) -> fmt::Result {
         write!(fmt, "{:?}", canonical_var_kinds.as_slice(&Interner))
     }
-    pub fn debug_program_clause(
+    pub(crate) fn debug_program_clause(
         &self,
         clause: &chalk_ir::ProgramClause<Interner>,
         fmt: &mut fmt::Formatter<'_>,
     ) -> fmt::Result {
         write!(fmt, "{:?}", clause.data(&Interner))
     }
-    pub fn debug_program_clauses(
+    pub(crate) fn debug_program_clauses(
         &self,
         clauses: &chalk_ir::ProgramClauses<Interner>,
         fmt: &mut fmt::Formatter<'_>,
     ) -> fmt::Result {
         write!(fmt, "{:?}", clauses.as_slice(&Interner))
     }
-    pub fn debug_quantified_where_clauses(
+    pub(crate) fn debug_quantified_where_clauses(
         &self,
         clauses: &chalk_ir::QuantifiedWhereClauses<Interner>,
         fmt: &mut fmt::Formatter<'_>,
@@ -249,7 +249,7 @@ mod unsafe_tls {
 
     scoped_thread_local!(static PROGRAM: DebugContext);
 
-    pub fn with_current_program<R>(
+    pub(crate) fn with_current_program<R>(
         op: impl for<'a> FnOnce(Option<&'a DebugContext<'a>>) -> R,
     ) -> R {
         if PROGRAM.is_set() {
@@ -259,7 +259,7 @@ mod unsafe_tls {
         }
     }
 
-    pub fn set_current_program<OP, R>(p: &dyn HirDatabase, op: OP) -> R
+    pub(crate) fn set_current_program<OP, R>(p: &dyn HirDatabase, op: OP) -> R
     where
         OP: FnOnce() -> R,
     {
diff --git a/crates/mbe/src/mbe_expander/matcher.rs b/crates/mbe/src/mbe_expander/matcher.rs
index b698b9832..39a8eefbd 100644
--- a/crates/mbe/src/mbe_expander/matcher.rs
+++ b/crates/mbe/src/mbe_expander/matcher.rs
@@ -61,16 +61,16 @@ macro_rules! err {
 
 #[derive(Debug, Default)]
 pub(super) struct Match {
-    pub bindings: Bindings,
+    pub(super) bindings: Bindings,
     /// We currently just keep the first error and count the rest to compare matches.
-    pub err: Option<ExpandError>,
-    pub err_count: usize,
+    pub(super) err: Option<ExpandError>,
+    pub(super) err_count: usize,
     /// How many top-level token trees were left to match.
-    pub unmatched_tts: usize,
+    pub(super) unmatched_tts: usize,
 }
 
 impl Match {
-    pub fn add_err(&mut self, err: ExpandError) {
+    pub(super) fn add_err(&mut self, err: ExpandError) {
         let prev_err = self.err.take();
         self.err = prev_err.or(Some(err));
         self.err_count += 1;
diff --git a/crates/mbe/src/subtree_source.rs b/crates/mbe/src/subtree_source.rs
index 396ce8b16..38237cdcf 100644
--- a/crates/mbe/src/subtree_source.rs
+++ b/crates/mbe/src/subtree_source.rs
@@ -7,9 +7,9 @@ use tt::buffer::{Cursor, TokenBuffer};
 
 #[derive(Debug, Clone, Eq, PartialEq)]
 struct TtToken {
-    pub kind: SyntaxKind,
-    pub is_joint_to_next: bool,
-    pub text: SmolStr,
+    kind: SyntaxKind,
+    is_joint_to_next: bool,
+    text: SmolStr,
 }
 
 pub(crate) struct SubtreeTokenSource<'a> {
@@ -30,7 +30,7 @@ impl<'a> SubtreeTokenSource<'a> {
 }
 
 impl<'a> SubtreeTokenSource<'a> {
-    pub fn new(buffer: &'a TokenBuffer) -> SubtreeTokenSource<'a> {
+    pub(crate) fn new(buffer: &'a TokenBuffer) -> SubtreeTokenSource<'a> {
         let cursor = buffer.begin();
 
         let mut res = SubtreeTokenSource {
diff --git a/crates/proc_macro_api/src/process.rs b/crates/proc_macro_api/src/process.rs
index 51ffcaa78..907cb3db7 100644
--- a/crates/proc_macro_api/src/process.rs
+++ b/crates/proc_macro_api/src/process.rs
@@ -30,7 +30,7 @@ pub(crate) struct ProcMacroProcessThread {
 }
 
 impl ProcMacroProcessSrv {
-    pub fn run(
+    pub(crate) fn run(
         process_path: PathBuf,
         args: impl IntoIterator<Item = impl AsRef<OsStr>>,
     ) -> io::Result<(ProcMacroProcessThread, ProcMacroProcessSrv)> {
@@ -48,7 +48,7 @@ impl ProcMacroProcessSrv {
         Ok((thread, srv))
     }
 
-    pub fn find_proc_macros(
+    pub(crate) fn find_proc_macros(
         &self,
         dylib_path: &Path,
     ) -> Result<Vec<(String, ProcMacroKind)>, tt::ExpansionError> {
@@ -58,7 +58,7 @@ impl ProcMacroProcessSrv {
         Ok(result.macros)
     }
 
-    pub fn custom_derive(
+    pub(crate) fn custom_derive(
         &self,
         dylib_path: &Path,
         subtree: &Subtree,
@@ -75,7 +75,7 @@ impl ProcMacroProcessSrv {
         Ok(result.expansion)
     }
 
-    pub fn send_task<R>(&self, req: Request) -> Result<R, tt::ExpansionError>
+    pub(crate) fn send_task<R>(&self, req: Request) -> Result<R, tt::ExpansionError>
     where
         R: TryFrom<Response, Error = &'static str>,
     {
diff --git a/crates/proc_macro_api/src/rpc.rs b/crates/proc_macro_api/src/rpc.rs
index 47624163e..203109ca4 100644
--- a/crates/proc_macro_api/src/rpc.rs
+++ b/crates/proc_macro_api/src/rpc.rs
@@ -75,18 +75,18 @@ struct TokenIdDef(u32);
 #[serde(remote = "Delimiter")]
 struct DelimiterDef {
     #[serde(with = "TokenIdDef")]
-    pub id: TokenId,
+    id: TokenId,
     #[serde(with = "DelimiterKindDef")]
-    pub kind: DelimiterKind,
+    kind: DelimiterKind,
 }
 
 #[derive(Serialize, Deserialize)]
 #[serde(remote = "Subtree")]
 struct SubtreeDef {
     #[serde(default, with = "opt_delimiter_def")]
-    pub delimiter: Option<Delimiter>,
+    delimiter: Option<Delimiter>,
     #[serde(with = "vec_token_tree")]
-    pub token_trees: Vec<TokenTree>,
+    token_trees: Vec<TokenTree>,
 }
 
 #[derive(Serialize, Deserialize)]
@@ -112,19 +112,19 @@ enum LeafDef {
 #[derive(Serialize, Deserialize)]
 #[serde(remote = "Literal")]
 struct LiteralDef {
-    pub text: SmolStr,
+    text: SmolStr,
     #[serde(with = "TokenIdDef")]
-    pub id: TokenId,
+    id: TokenId,
 }
 
 #[derive(Serialize, Deserialize)]
 #[serde(remote = "Punct")]
 struct PunctDef {
-    pub char: char,
+    char: char,
     #[serde(with = "SpacingDef")]
-    pub spacing: Spacing,
+    spacing: Spacing,
     #[serde(with = "TokenIdDef")]
-    pub id: TokenId,
+    id: TokenId,
 }
 
 #[derive(Serialize, Deserialize)]
@@ -137,16 +137,16 @@ enum SpacingDef {
 #[derive(Serialize, Deserialize)]
 #[serde(remote = "Ident")]
 struct IdentDef {
-    pub text: SmolStr,
+    text: SmolStr,
     #[serde(with = "TokenIdDef")]
-    pub id: TokenId,
+    id: TokenId,
 }
 
 mod opt_delimiter_def {
     use super::{Delimiter, DelimiterDef};
     use serde::{Deserialize, Deserializer, Serialize, Serializer};
 
-    pub fn serialize<S>(value: &Option<Delimiter>, serializer: S) -> Result<S::Ok, S::Error>
+    pub(super) fn serialize<S>(value: &Option<Delimiter>, serializer: S) -> Result<S::Ok, S::Error>
     where
         S: Serializer,
     {
@@ -155,7 +155,7 @@ mod opt_delimiter_def {
         value.as_ref().map(Helper).serialize(serializer)
     }
 
-    pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<Delimiter>, D::Error>
+    pub(super) fn deserialize<'de, D>(deserializer: D) -> Result<Option<Delimiter>, D::Error>
     where
         D: Deserializer<'de>,
     {
@@ -170,7 +170,7 @@ mod opt_subtree_def {
     use super::{Subtree, SubtreeDef};
     use serde::{Deserialize, Deserializer, Serialize, Serializer};
 
-    pub fn serialize<S>(value: &Option<Subtree>, serializer: S) -> Result<S::Ok, S::Error>
+    pub(super) fn serialize<S>(value: &Option<Subtree>, serializer: S) -> Result<S::Ok, S::Error>
     where
         S: Serializer,
     {
@@ -179,7 +179,7 @@ mod opt_subtree_def {
         value.as_ref().map(Helper).serialize(serializer)
     }
 
-    pub fn deserialize<'de, D>(deserializer: D) -> Result<Option<Subtree>, D::Error>
+    pub(super) fn deserialize<'de, D>(deserializer: D) -> Result<Option<Subtree>, D::Error>
     where
         D: Deserializer<'de>,
     {
@@ -194,7 +194,7 @@ mod vec_token_tree {
     use super::{TokenTree, TokenTreeDef};
     use serde::{ser::SerializeSeq, Deserialize, Deserializer, Serialize, Serializer};
 
-    pub fn serialize<S>(value: &Vec<TokenTree>, serializer: S) -> Result<S::Ok, S::Error>
+    pub(super) fn serialize<S>(value: &Vec<TokenTree>, serializer: S) -> Result<S::Ok, S::Error>
     where
         S: Serializer,
     {
@@ -209,7 +209,7 @@ mod vec_token_tree {
         seq.end()
     }
 
-    pub fn deserialize<'de, D>(deserializer: D) -> Result<Vec<TokenTree>, D::Error>
+    pub(super) fn deserialize<'de, D>(deserializer: D) -> Result<Vec<TokenTree>, D::Error>
     where
         D: Deserializer<'de>,
     {
diff --git a/crates/proc_macro_srv/src/lib.rs b/crates/proc_macro_srv/src/lib.rs
index 7e4e4ad50..6e890f8e2 100644
--- a/crates/proc_macro_srv/src/lib.rs
+++ b/crates/proc_macro_srv/src/lib.rs
@@ -9,6 +9,7 @@
 //!   RA than `proc-macro2` token stream.
 //! * By **copying** the whole rustc `lib_proc_macro` code, we are able to build this with `stable`
 //!   rustc rather than `unstable`. (Although in general ABI compatibility is still an issue)…
+#![allow(unreachable_pub)]
 
 #[allow(dead_code)]
 #[doc(hidden)]
diff --git a/crates/profile/src/hprof.rs b/crates/profile/src/hprof.rs
index 934cc8e37..8957ea016 100644
--- a/crates/profile/src/hprof.rs
+++ b/crates/profile/src/hprof.rs
@@ -27,7 +27,7 @@ pub fn init_from(spec: &str) {
     filter.install();
 }
 
-pub type Label = &'static str;
+type Label = &'static str;
 
 /// This function starts a profiling scope in the current execution stack with a given description.
 /// It returns a `Profile` struct that measures elapsed time between this method invocation and `Profile` struct drop.
@@ -173,7 +173,7 @@ impl ProfileStack {
         true
     }
 
-    pub fn pop(&mut self, label: Label, detail: Option<String>) {
+    fn pop(&mut self, label: Label, detail: Option<String>) {
         let start = self.starts.pop().unwrap();
         let duration = start.elapsed();
         self.messages.finish(Message { duration, label, detail });
diff --git a/crates/profile/src/tree.rs b/crates/profile/src/tree.rs
index 096f58511..3fac1f36c 100644
--- a/crates/profile/src/tree.rs
+++ b/crates/profile/src/tree.rs
@@ -4,15 +4,15 @@ use std::ops;
 use arena::Arena;
 
 #[derive(Default)]
-pub struct Tree<T> {
+pub(crate) struct Tree<T> {
     nodes: Arena<Node<T>>,
     current_path: Vec<(Idx<T>, Option<Idx<T>>)>,
 }
 
-pub type Idx<T> = arena::Idx<Node<T>>;
+pub(crate) type Idx<T> = arena::Idx<Node<T>>;
 
 impl<T> Tree<T> {
-    pub fn start(&mut self)
+    pub(crate) fn start(&mut self)
     where
         T: Default,
     {
@@ -30,19 +30,19 @@ impl<T> Tree<T> {
         self.current_path.push((me, None));
     }
 
-    pub fn finish(&mut self, data: T) {
+    pub(crate) fn finish(&mut self, data: T) {
         let (me, _last_child) = self.current_path.pop().unwrap();
         self.nodes[me].data = data;
     }
 
-    pub fn root(&self) -> Option<Idx<T>> {
+    pub(crate) fn root(&self) -> Option<Idx<T>> {
         self.nodes.iter().next().map(|(idx, _)| idx)
     }
 
-    pub fn children(&self, idx: Idx<T>) -> impl Iterator<Item = Idx<T>> + '_ {
+    pub(crate) fn children(&self, idx: Idx<T>) -> impl Iterator<Item = Idx<T>> + '_ {
         NodeIter { nodes: &self.nodes, next: self.nodes[idx].first_child }
     }
-    pub fn clear(&mut self) {
+    pub(crate) fn clear(&mut self) {
         self.nodes.clear();
         self.current_path.clear();
     }
@@ -55,7 +55,7 @@ impl<T> ops::Index<Idx<T>> for Tree<T> {
     }
 }
 
-pub struct Node<T> {
+pub(crate) struct Node<T> {
     data: T,
     first_child: Option<Idx<T>>,
     next_sibling: Option<Idx<T>>,
diff --git a/crates/syntax/src/ast.rs b/crates/syntax/src/ast.rs
index d536bb1e7..8a0e3d27b 100644
--- a/crates/syntax/src/ast.rs
+++ b/crates/syntax/src/ast.rs
@@ -17,7 +17,7 @@ use crate::{
 
 pub use self::{
     expr_ext::{ArrayExprKind, BinOp, Effect, ElseBranch, LiteralKind, PrefixOp, RangeOp},
-    generated::*,
+    generated::{nodes::*, tokens::*},
     node_ext::{
         AttrKind, FieldKind, NameOrNameRef, PathSegmentKind, SelfParamKind, SlicePatComponents,
         StructKind, TypeBoundKind, VisibilityKind,
diff --git a/crates/syntax/src/ast/generated.rs b/crates/syntax/src/ast/generated.rs
index 4a6f41ee7..843b43cf0 100644
--- a/crates/syntax/src/ast/generated.rs
+++ b/crates/syntax/src/ast/generated.rs
@@ -1,8 +1,8 @@
 //! This file is actually hand-written, but the submodules are indeed generated.
 #[rustfmt::skip]
-mod nodes;
+pub(crate) mod nodes;
 #[rustfmt::skip]
-mod tokens;
+pub(crate) mod tokens;
 
 use crate::{
     AstNode,
@@ -10,7 +10,7 @@ use crate::{
     SyntaxNode,
 };
 
-pub use {nodes::*, tokens::*};
+pub(crate) use nodes::*;
 
 // Stmt is the only nested enum, so it's easier to just hand-write it
 impl AstNode for Stmt {
diff --git a/crates/syntax/src/lib.rs b/crates/syntax/src/lib.rs
index 849a1cdd6..e753b11bb 100644
--- a/crates/syntax/src/lib.rs
+++ b/crates/syntax/src/lib.rs
@@ -46,16 +46,19 @@ use text_edit::Indel;
 pub use crate::{
     algo::InsertPosition,
     ast::{AstNode, AstToken},
-    parsing::{lex_single_syntax_kind, lex_single_valid_syntax_kind, tokenize, Token},
+    parsing::lexer::{lex_single_syntax_kind, lex_single_valid_syntax_kind, tokenize, Token},
     ptr::{AstPtr, SyntaxNodePtr},
     syntax_error::SyntaxError,
     syntax_node::{
-        Direction, GreenNode, NodeOrToken, SyntaxElement, SyntaxElementChildren, SyntaxNode,
-        SyntaxNodeChildren, SyntaxToken, SyntaxTreeBuilder,
+        SyntaxElement, SyntaxElementChildren, SyntaxNode, SyntaxNodeChildren, SyntaxToken,
+        SyntaxTreeBuilder,
     },
 };
 pub use parser::{SyntaxKind, T};
-pub use rowan::{SmolStr, SyntaxText, TextRange, TextSize, TokenAtOffset, WalkEvent};
+pub use rowan::{
+    Direction, GreenNode, NodeOrToken, SmolStr, SyntaxText, TextRange, TextSize, TokenAtOffset,
+    WalkEvent,
+};
 
 /// `Parse` is the result of the parsing: a syntax tree and a collection of
 /// errors.
diff --git a/crates/syntax/src/parsing.rs b/crates/syntax/src/parsing.rs
index 68a39eb21..333bde54a 100644
--- a/crates/syntax/src/parsing.rs
+++ b/crates/syntax/src/parsing.rs
@@ -1,7 +1,7 @@
 //! Lexing, bridging to parser (which does the actual parsing) and
 //! incremental reparsing.
 
-mod lexer;
+pub(crate) mod lexer;
 mod text_token_source;
 mod text_tree_sink;
 mod reparsing;
@@ -10,7 +10,7 @@ use crate::{syntax_node::GreenNode, AstNode, SyntaxError, SyntaxNode};
 use text_token_source::TextTokenSource;
 use text_tree_sink::TextTreeSink;
 
-pub use lexer::*;
+pub(crate) use lexer::*;
 
 pub(crate) use self::reparsing::incremental_reparse;
 use parser::SyntaxKind;
diff --git a/crates/syntax/src/parsing/text_token_source.rs b/crates/syntax/src/parsing/text_token_source.rs
index df866dc2b..0614194a5 100644
--- a/crates/syntax/src/parsing/text_token_source.rs
+++ b/crates/syntax/src/parsing/text_token_source.rs
@@ -65,7 +65,7 @@ fn mk_token(pos: usize, token_offset_pairs: &[(Token, TextSize)]) -> parser::Tok
 
 impl<'t> TextTokenSource<'t> {
     /// Generate input from tokens(expect comment and whitespace).
-    pub fn new(text: &'t str, raw_tokens: &'t [Token]) -> TextTokenSource<'t> {
+    pub(crate) fn new(text: &'t str, raw_tokens: &'t [Token]) -> TextTokenSource<'t> {
         let token_offset_pairs: Vec<_> = raw_tokens
             .iter()
             .filter_map({
diff --git a/crates/syntax/src/syntax_node.rs b/crates/syntax/src/syntax_node.rs
index b2abcbfbb..cc30138fa 100644
--- a/crates/syntax/src/syntax_node.rs
+++ b/crates/syntax/src/syntax_node.rs
@@ -10,9 +10,7 @@ use rowan::{GreenNodeBuilder, Language};
 
 use crate::{Parse, SmolStr, SyntaxError, SyntaxKind, TextSize};
 
-pub use rowan::GreenNode;
-
-pub(crate) use rowan::GreenToken;
+pub(crate) use rowan::{GreenNode, GreenToken, NodeOrToken};
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub enum RustLanguage {}
@@ -34,8 +32,6 @@ pub type SyntaxElement = rowan::SyntaxElement<RustLanguage>;
 pub type SyntaxNodeChildren = rowan::SyntaxNodeChildren<RustLanguage>;
 pub type SyntaxElementChildren = rowan::SyntaxElementChildren<RustLanguage>;
 
-pub use rowan::{Direction, NodeOrToken};
-
 #[derive(Default)]
 pub struct SyntaxTreeBuilder {
     errors: Vec<SyntaxError>,
diff --git a/crates/vfs/src/vfs_path.rs b/crates/vfs/src/vfs_path.rs
index 022a0be1e..7a213fc3e 100644
--- a/crates/vfs/src/vfs_path.rs
+++ b/crates/vfs/src/vfs_path.rs
@@ -287,7 +287,7 @@ impl VirtualPath {
         Some(res)
     }
 
-    pub fn name_and_extension(&self) -> Option<(&str, Option<&str>)> {
+    pub(crate) fn name_and_extension(&self) -> Option<(&str, Option<&str>)> {
         let file_path = if self.0.ends_with('/') { &self.0[..&self.0.len() - 1] } else { &self.0 };
         let file_name = match file_path.rfind('/') {
             Some(position) => &file_path[position + 1..],