syntax: misc extractions

src/librustc/hir/lowering.rs

@@ -67,11 +67,11 @@ use syntax::errors;
 use syntax::ext::base::SpecialDerives;
 use syntax::ext::hygiene::ExpnId;
 use syntax::print::pprust;
-use syntax::source_map::{respan, ExpnData, ExpnKind, DesugaringKind, Spanned};
-use syntax::symbol::{kw, sym, Symbol};
 use syntax::tokenstream::{TokenStream, TokenTree};
 use syntax::parse::token::{self, Nonterminal, Token};
-use syntax::parse::ParseSess;
+use syntax::sess::ParseSess;
+use syntax::source_map::{respan, ExpnData, ExpnKind, DesugaringKind, Spanned};
+use syntax::symbol::{kw, sym, Symbol};
 use syntax::visit::{self, Visitor};
 use syntax_pos::Span;
 

src/librustc/hir/print.rs

@@ -1,10 +1,10 @@
 use rustc_target::spec::abi::Abi;
 use syntax::ast;
 use syntax::source_map::{SourceMap, Spanned};
-use syntax::parse::ParseSess;
 use syntax::print::pp::{self, Breaks};
 use syntax::print::pp::Breaks::{Consistent, Inconsistent};
 use syntax::print::pprust::{self, Comments, PrintState};
+use syntax::sess::ParseSess;
 use syntax::symbol::kw;
 use syntax::util::parser::{self, AssocOp, Fixity};
 use syntax_pos::{self, BytePos, FileName};

src/librustc/session/config.rs

@@ -16,8 +16,9 @@ use syntax;
 use syntax::ast::{self, IntTy, UintTy, MetaItemKind};
 use syntax::source_map::{FileName, FilePathMapping};
 use syntax::edition::{Edition, EDITION_NAME_LIST, DEFAULT_EDITION};
-use syntax::parse::{ParseSess, new_parser_from_source_str};
+use syntax::parse::new_parser_from_source_str;
 use syntax::parse::token;
+use syntax::sess::ParseSess;
 use syntax::symbol::{sym, Symbol};
 use syntax::feature_gate::UnstableFeatures;
 use syntax::source_map::SourceMap;

src/librustc/session/mod.rs

@@ -28,7 +28,7 @@ use syntax::ext::allocator::AllocatorKind;
 use syntax::feature_gate::{self, AttributeType};
 use syntax::json::JsonEmitter;
 use syntax::source_map;
-use syntax::parse::{self, ParseSess};
+use syntax::sess::ParseSess;
 use syntax::symbol::Symbol;
 use syntax_pos::{MultiSpan, Span};
 use crate::util::profiling::{SelfProfiler, SelfProfilerRef};
@@ -1159,7 +1159,7 @@ fn build_session_(
     );
     let target_cfg = config::build_target_config(&sopts, &span_diagnostic);
 
-    let parse_sess = parse::ParseSess::with_span_handler(
+    let parse_sess = ParseSess::with_span_handler(
         span_diagnostic,
         source_map,
     );

src/librustdoc/clean/cfg.rs

@@ -9,7 +9,7 @@ use std::ops;
 
 use syntax::symbol::{Symbol, sym};
 use syntax::ast::{MetaItem, MetaItemKind, NestedMetaItem, LitKind};
-use syntax::parse::ParseSess;
+use syntax::sess::ParseSess;
 use syntax::feature_gate::Features;
 
 use syntax_pos::Span;

src/librustdoc/html/highlight.rs

@@ -14,7 +14,7 @@ use std::io::prelude::*;
 use syntax::source_map::{SourceMap, FilePathMapping};
 use syntax::parse::lexer;
 use syntax::parse::token::{self, Token};
-use syntax::parse;
+use syntax::sess::ParseSess;
 use syntax::symbol::{kw, sym};
 use syntax_pos::{Span, FileName};
 
@@ -33,7 +33,7 @@ pub fn render_with_highlighting(
                class, tooltip).unwrap();
     }
 
-    let sess = parse::ParseSess::new(FilePathMapping::empty());
+    let sess = ParseSess::new(FilePathMapping::empty());
     let fm = sess.source_map().new_source_file(
         FileName::Custom(String::from("rustdoc-highlighting")),
         src.to_owned(),

src/librustdoc/passes/check_code_block_syntax.rs

@@ -1,6 +1,7 @@
 use errors::Applicability;
 use syntax::parse::lexer::{StringReader as Lexer};
-use syntax::parse::{ParseSess, token};
+use syntax::parse::token;
+use syntax::sess::ParseSess;
 use syntax::source_map::FilePathMapping;
 use syntax_pos::{InnerSpan, FileName};
 

src/librustdoc/test.rs

@@ -394,7 +394,7 @@ pub fn make_test(s: &str,
     // Uses libsyntax to parse the doctest and find if there's a main fn and the extern
     // crate already is included.
     let (already_has_main, already_has_extern_crate, found_macro) = with_globals(edition, || {
-        use crate::syntax::{parse::{self, ParseSess}, source_map::FilePathMapping};
+        use crate::syntax::{parse, sess::ParseSess, source_map::FilePathMapping};
         use errors::emitter::EmitterWriter;
         use errors::Handler;
 

src/libsyntax/attr/builtin.rs

@@ -4,8 +4,8 @@ use crate::ast::{self, Attribute, MetaItem, NestedMetaItem};
 use crate::early_buffered_lints::BufferedEarlyLintId;
 use crate::ext::base::ExtCtxt;
 use crate::feature_gate::{Features, GatedCfg};
-use crate::parse::ParseSess;
 use crate::print::pprust;
+use crate::sess::ParseSess;
 
 use errors::{Applicability, Handler};
 use syntax_pos::hygiene::Transparency;

src/libsyntax/attr/mod.rs

@@ -16,9 +16,10 @@ use crate::mut_visit::visit_clobber;
 use crate::source_map::{BytePos, Spanned, DUMMY_SP};
 use crate::parse::lexer::comments::{doc_comment_style, strip_doc_comment_decoration};
 use crate::parse::parser::Parser;
-use crate::parse::{ParseSess, PResult};
+use crate::parse::PResult;
 use crate::parse::token::{self, Token};
 use crate::ptr::P;
+use crate::sess::ParseSess;
 use crate::symbol::{sym, Symbol};
 use crate::ThinVec;
 use crate::tokenstream::{TokenStream, TokenTree, DelimSpan};

src/libsyntax/config.rs

@@ -10,8 +10,9 @@ use crate::attr;
 use crate::ast;
 use crate::edition::Edition;
 use crate::mut_visit::*;
-use crate::parse::{token, ParseSess};
+use crate::parse::token;
 use crate::ptr::P;
+use crate::sess::ParseSess;
 use crate::symbol::sym;
 use crate::util::map_in_place::MapInPlace;
 

src/libsyntax/ext/base.rs

@@ -5,9 +5,10 @@ use crate::edition::Edition;
 use crate::ext::expand::{self, AstFragment, Invocation};
 use crate::ext::hygiene::ExpnId;
 use crate::mut_visit::{self, MutVisitor};
-use crate::parse::{self, parser, ParseSess, DirectoryOwnership};
+use crate::parse::{self, parser, DirectoryOwnership};
 use crate::parse::token;
 use crate::ptr::P;
+use crate::sess::ParseSess;
 use crate::symbol::{kw, sym, Ident, Symbol};
 use crate::{ThinVec, MACRO_ARGUMENTS};
 use crate::tokenstream::{self, TokenStream};
@@ -892,7 +893,7 @@ pub struct ExpansionData {
 /// when a macro expansion occurs, the resulting nodes have the `backtrace()
 /// -> expn_data` of their expansion context stored into their span.
 pub struct ExtCtxt<'a> {
-    pub parse_sess: &'a parse::ParseSess,
+    pub parse_sess: &'a ParseSess,
     pub ecfg: expand::ExpansionConfig<'a>,
     pub root_path: PathBuf,
     pub resolver: &'a mut dyn Resolver,
@@ -901,7 +902,7 @@ pub struct ExtCtxt<'a> {
 }
 
 impl<'a> ExtCtxt<'a> {
-    pub fn new(parse_sess: &'a parse::ParseSess,
+    pub fn new(parse_sess: &'a ParseSess,
                ecfg: expand::ExpansionConfig<'a>,
                resolver: &'a mut dyn Resolver)
                -> ExtCtxt<'a> {
@@ -935,7 +936,7 @@ impl<'a> ExtCtxt<'a> {
         parse::stream_to_parser(self.parse_sess, stream, MACRO_ARGUMENTS)
     }
     pub fn source_map(&self) -> &'a SourceMap { self.parse_sess.source_map() }
-    pub fn parse_sess(&self) -> &'a parse::ParseSess { self.parse_sess }
+    pub fn parse_sess(&self) -> &'a ParseSess { self.parse_sess }
     pub fn cfg(&self) -> &ast::CrateConfig { &self.parse_sess.config }
     pub fn call_site(&self) -> Span {
         self.current_expansion.id.expn_data().call_site

src/libsyntax/ext/expand.rs

@@ -10,11 +10,12 @@ use crate::ext::mbe::macro_rules::annotate_err_with_kind;
 use crate::ext::placeholders::{placeholder, PlaceholderExpander};
 use crate::feature_gate::{self, Features, GateIssue, is_builtin_attr, emit_feature_err};
 use crate::mut_visit::*;
-use crate::parse::{DirectoryOwnership, PResult, ParseSess};
+use crate::parse::{DirectoryOwnership, PResult};
 use crate::parse::token;
 use crate::parse::parser::Parser;
 use crate::print::pprust;
 use crate::ptr::P;
+use crate::sess::ParseSess;
 use crate::symbol::{sym, Symbol};
 use crate::tokenstream::{TokenStream, TokenTree};
 use crate::visit::{self, Visitor};

src/libsyntax/ext/mbe/macro_check.rs

@@ -109,7 +109,7 @@ use crate::early_buffered_lints::BufferedEarlyLintId;
 use crate::ext::mbe::{KleeneToken, TokenTree};
 use crate::parse::token::TokenKind;
 use crate::parse::token::{DelimToken, Token};
-use crate::parse::ParseSess;
+use crate::sess::ParseSess;
 use crate::symbol::{kw, sym};
 
 use rustc_data_structures::fx::FxHashMap;

src/libsyntax/ext/mbe/macro_parser.rs

@@ -76,10 +76,11 @@ use TokenTreeOrTokenTreeSlice::*;
 
 use crate::ast::{Ident, Name};
 use crate::ext::mbe::{self, TokenTree};
-use crate::parse::{Directory, ParseSess, PResult};
+use crate::parse::{Directory, PResult};
 use crate::parse::parser::{Parser, PathStyle};
 use crate::parse::token::{self, DocComment, Nonterminal, Token};
 use crate::print::pprust;
+use crate::sess::ParseSess;
 use crate::symbol::{kw, sym, Symbol};
 use crate::tokenstream::{DelimSpan, TokenStream};
 

src/libsyntax/ext/mbe/macro_rules.rs

@@ -14,8 +14,9 @@ use crate::feature_gate::Features;
 use crate::parse::parser::Parser;
 use crate::parse::token::TokenKind::*;
 use crate::parse::token::{self, NtTT, Token};
-use crate::parse::{Directory, ParseSess};
+use crate::parse::Directory;
 use crate::print::pprust;
+use crate::sess::ParseSess;
 use crate::symbol::{kw, sym, Symbol};
 use crate::tokenstream::{DelimSpan, TokenStream, TokenTree};
 

src/libsyntax/ext/mbe/quoted.rs

@@ -2,8 +2,8 @@ use crate::ast;
 use crate::ext::mbe::macro_parser;
 use crate::ext::mbe::{TokenTree, KleeneOp, KleeneToken, SequenceRepetition, Delimited};
 use crate::parse::token::{self, Token};
-use crate::parse::ParseSess;
 use crate::print::pprust;
+use crate::sess::ParseSess;
 use crate::symbol::kw;
 use crate::tokenstream;
 

src/libsyntax/ext/proc_macro_server.rs

@@ -1,8 +1,9 @@
 use crate::ast;
 use crate::ext::base::ExtCtxt;
-use crate::parse::{self, token, ParseSess};
+use crate::parse::{self, token};
 use crate::parse::lexer::comments;
 use crate::print::pprust;
+use crate::sess::ParseSess;
 use crate::tokenstream::{self, DelimSpan, IsJoint::*, TokenStream, TreeAndJoint};
 
 use errors::Diagnostic;

src/libsyntax/feature_gate/builtin_attrs.rs

@@ -9,8 +9,8 @@ use super::active::Features;
 
 use crate::ast;
 use crate::attr::AttributeTemplate;
+use crate::sess::ParseSess;
 use crate::symbol::{Symbol, sym};
-use crate::parse::ParseSess;
 
 use syntax_pos::Span;
 use rustc_data_structures::fx::FxHashMap;

src/libsyntax/feature_gate/check.rs

@@ -5,14 +5,14 @@ use super::builtin_attrs::{AttributeGate, BUILTIN_ATTRIBUTE_MAP};
 
 use crate::ast::{
     self, AssocTyConstraint, AssocTyConstraintKind, NodeId, GenericParam, GenericParamKind,
-    PatKind, RangeEnd,
+    PatKind, RangeEnd, VariantData,
 };
 use crate::attr::{self, check_builtin_attribute};
 use crate::source_map::Spanned;
 use crate::edition::{ALL_EDITIONS, Edition};
 use crate::visit::{self, FnKind, Visitor};
-use crate::parse::{token, ParseSess};
-use crate::parse::parser::Parser;
+use crate::parse::token;
+use crate::sess::ParseSess;
 use crate::symbol::{Symbol, sym};
 use crate::tokenstream::TokenTree;
 
@@ -246,6 +246,51 @@ impl<'a> PostExpansionVisitor<'a> {
             Abi::System => {}
         }
     }
+
+    fn maybe_report_invalid_custom_discriminants(&self, variants: &[ast::Variant]) {
+        let has_fields = variants.iter().any(|variant| match variant.data {
+            VariantData::Tuple(..) | VariantData::Struct(..) => true,
+            VariantData::Unit(..) => false,
+        });
+
+        let discriminant_spans = variants.iter().filter(|variant| match variant.data {
+            VariantData::Tuple(..) | VariantData::Struct(..) => false,
+            VariantData::Unit(..) => true,
+        })
+        .filter_map(|variant| variant.disr_expr.as_ref().map(|c| c.value.span))
+        .collect::<Vec<_>>();
+
+        if !discriminant_spans.is_empty() && has_fields {
+            let mut err = feature_err(
+                self.parse_sess,
+                sym::arbitrary_enum_discriminant,
+                discriminant_spans.clone(),
+                crate::feature_gate::GateIssue::Language,
+                "custom discriminant values are not allowed in enums with tuple or struct variants",
+            );
+            for sp in discriminant_spans {
+                err.span_label(sp, "disallowed custom discriminant");
+            }
+            for variant in variants.iter() {
+                match &variant.data {
+                    VariantData::Struct(..) => {
+                        err.span_label(
+                            variant.span,
+                            "struct variant defined here",
+                        );
+                    }
+                    VariantData::Tuple(..) => {
+                        err.span_label(
+                            variant.span,
+                            "tuple variant defined here",
+                        );
+                    }
+                    VariantData::Unit(..) => {}
+                }
+            }
+            err.emit();
+        }
+    }
 }
 
 impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
@@ -353,7 +398,7 @@ impl<'a> Visitor<'a> for PostExpansionVisitor<'a> {
 
                 let has_feature = self.features.arbitrary_enum_discriminant;
                 if !has_feature && !i.span.allows_unstable(sym::arbitrary_enum_discriminant) {
-                    Parser::maybe_report_invalid_custom_discriminants(self.parse_sess, &variants);
+                    self.maybe_report_invalid_custom_discriminants(&variants);
                 }
             }
 

src/libsyntax/lib.rs

@@ -147,6 +147,7 @@ pub mod ptr;
 pub mod show_span;
 pub use syntax_pos::edition;
 pub use syntax_pos::symbol;
+pub mod sess;
 pub mod tokenstream;
 pub mod visit;