syntax: Some code cleanup

src/libsyntax/parse/token.rs

@@ -73,6 +73,7 @@ pub enum LitKind {
     Err,
 }
 
+/// A literal token.
 #[derive(Clone, Copy, PartialEq, RustcEncodable, RustcDecodable, Debug)]
 pub struct Lit {
     pub kind: LitKind,
@@ -81,6 +82,7 @@ pub struct Lit {
 }
 
 impl LitKind {
+    /// An English article for the literal token kind.
     crate fn article(self) -> &'static str {
         match self {
             Integer | Err => "an",
@@ -91,13 +93,13 @@ impl LitKind {
     crate fn descr(self) -> &'static str {
         match self {
             Bool => panic!("literal token contains `Lit::Bool`"),
-            Byte => "byte literal",
-            Char => "char literal",
-            Integer => "integer literal",
-            Float => "float literal",
-            Str | StrRaw(..) => "string literal",
-            ByteStr | ByteStrRaw(..) => "byte string literal",
-            Err => "invalid literal",
+            Byte => "byte",
+            Char => "char",
+            Integer => "integer",
+            Float => "float",
+            Str | StrRaw(..) => "string",
+            ByteStr | ByteStrRaw(..) => "byte string",
+            Err => "error",
         }
     }
 

src/libsyntax/print/pprust.rs

@@ -163,7 +163,8 @@ fn binop_to_string(op: BinOpToken) -> &'static str {
     }
 }
 
-pub fn literal_to_string(token::Lit { kind, symbol, suffix }: token::Lit) -> String {
+pub fn literal_to_string(lit: token::Lit) -> String {
+    let token::Lit { kind, symbol, suffix } = lit;
     let mut out = match kind {
         token::Byte          => format!("b'{}'", symbol),
         token::Char          => format!("'{}'", symbol),

src/libsyntax_ext/proc_macro_server.rs

@@ -379,7 +379,7 @@ impl<'a> Rustc<'a> {
         }
     }
 
-    pub fn lit(&mut self, kind: token::LitKind, symbol: Symbol, suffix: Option<Symbol>) -> Literal {
+    fn lit(&mut self, kind: token::LitKind, symbol: Symbol, suffix: Option<Symbol>) -> Literal {
         Literal {
             lit: token::Lit::new(kind, symbol, suffix),
             span: server::Span::call_site(self),

src/libsyntax_pos/symbol.rs

@@ -246,6 +246,8 @@ symbols! {
         extern_prelude,
         extern_types,
         f16c_target_feature,
+        f32,
+        f64,
         feature,
         ffi_returns_twice,
         field_init_shorthand,

src/test/ui/parser/lex-bad-numeric-literals.rs

@@ -13,8 +13,10 @@ fn main() {
     0o; //~ ERROR: no valid digits
     1e+; //~ ERROR: expected at least one digit in exponent
     0x539.0; //~ ERROR: hexadecimal float literal is not supported
-    9900000000000000000000000000999999999999999999999999999999; //~ ERROR: integer literal is too large
-    9900000000000000000000000000999999999999999999999999999999; //~ ERROR: integer literal is too large
+    9900000000000000000000000000999999999999999999999999999999;
+    //~^ ERROR: integer literal is too large
+    9900000000000000000000000000999999999999999999999999999999;
+    //~^ ERROR: integer literal is too large
     0x; //~ ERROR: no valid digits
     0xu32; //~ ERROR: no valid digits
     0ou32; //~ ERROR: no valid digits

src/test/ui/parser/lex-bad-numeric-literals.stderr

@@ -65,43 +65,43 @@ LL |     0x539.0;
    |     ^^^^^^^
 
 error: no valid digits found for number
-  --> $DIR/lex-bad-numeric-literals.rs:18:5
+  --> $DIR/lex-bad-numeric-literals.rs:20:5
    |
 LL |     0x;
    |     ^^
 
 error: no valid digits found for number
-  --> $DIR/lex-bad-numeric-literals.rs:19:5
+  --> $DIR/lex-bad-numeric-literals.rs:21:5
    |
 LL |     0xu32;
    |     ^^
 
 error: no valid digits found for number
-  --> $DIR/lex-bad-numeric-literals.rs:20:5
+  --> $DIR/lex-bad-numeric-literals.rs:22:5
    |
 LL |     0ou32;
    |     ^^
 
 error: no valid digits found for number
-  --> $DIR/lex-bad-numeric-literals.rs:21:5
+  --> $DIR/lex-bad-numeric-literals.rs:23:5
    |
 LL |     0bu32;
    |     ^^
 
 error: no valid digits found for number
-  --> $DIR/lex-bad-numeric-literals.rs:22:5
+  --> $DIR/lex-bad-numeric-literals.rs:24:5
    |
 LL |     0b;
    |     ^^
 
 error: octal float literal is not supported
-  --> $DIR/lex-bad-numeric-literals.rs:24:5
+  --> $DIR/lex-bad-numeric-literals.rs:26:5
    |
 LL |     0o123.456;
    |     ^^^^^^^^^
 
 error: binary float literal is not supported
-  --> $DIR/lex-bad-numeric-literals.rs:26:5
+  --> $DIR/lex-bad-numeric-literals.rs:28:5
    |
 LL |     0b111.101;
    |     ^^^^^^^^^
@@ -119,19 +119,19 @@ LL |     9900000000000000000000000000999999999999999999999999999999;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: integer literal is too large
-  --> $DIR/lex-bad-numeric-literals.rs:17:5
+  --> $DIR/lex-bad-numeric-literals.rs:18:5
    |
 LL |     9900000000000000000000000000999999999999999999999999999999;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
 error: octal float literal is not supported
-  --> $DIR/lex-bad-numeric-literals.rs:23:5
+  --> $DIR/lex-bad-numeric-literals.rs:25:5
    |
 LL |     0o123f64;
    |     ^^^^^^^^ not supported
 
 error: binary float literal is not supported
-  --> $DIR/lex-bad-numeric-literals.rs:25:5
+  --> $DIR/lex-bad-numeric-literals.rs:27:5
    |
 LL |     0b101f64;
    |     ^^^^^^^^ not supported

src/test/ui/parser/no-hex-float-literal.rs

@@ -4,6 +4,6 @@ fn main() {
     0x567.89;
     //~^ ERROR hexadecimal float literal is not supported
     0xDEAD.BEEFp-2f;
-    //~^ ERROR invalid suffix `f` for integer literal
+    //~^ ERROR invalid suffix `f` for float literal
     //~| ERROR `{integer}` is a primitive type and therefore doesn't have fields
 }

src/test/ui/parser/no-hex-float-literal.stderr

@@ -4,13 +4,13 @@ error: hexadecimal float literal is not supported
 LL |     0x567.89;
    |     ^^^^^^^^
 
-error: invalid suffix `f` for integer literal
+error: invalid suffix `f` for float literal
   --> $DIR/no-hex-float-literal.rs:6:18
    |
 LL |     0xDEAD.BEEFp-2f;
    |                  ^^ invalid suffix `f`
    |
-   = help: the suffix must be one of the integral types (`u32`, `isize`, etc)
+   = help: valid suffixes are `f32` and `f64`
 
 error[E0610]: `{integer}` is a primitive type and therefore doesn't have fields
   --> $DIR/no-hex-float-literal.rs:2:11