Make non-ASCII errors more consistent.

There are three kinds of "byte" literals: byte literals, byte string
literals, and raw byte string literals. None are allowed to have
non-ASCII chars in them.

Two `EscapeError` variants exist for when that constraint is violated.
- `NonAsciiCharInByte`: used for byte literals and byte string literals.
- `NonAsciiCharInByteString`: used for raw byte string literals.

As a result, the messages for raw byte string literals use different
wording, without good reason. Also, byte string literals are incorrectly
described as "byte constants" in some error messages.

This commit eliminates `NonAsciiCharInByteString` so the three cases are
handled similarly, and described correctly. The `mode` is enough to
distinguish them.

Note: Some existing error messages mention "byte constants" and some
mention "byte literals". I went with the latter here, because it's a
more correct name, as used by the Reference.

8 files changed, 30 insertions, 30 deletions

diff --git a/src/test/ui/parser/byte-literals.rs b/src/test/ui/parser/byte-literals.rs
index 05a510b24a7..896dc1a1a5f 100644
--- a/src/test/ui/parser/byte-literals.rs
+++ b/src/test/ui/parser/byte-literals.rs
@@ -7,6 +7,6 @@ pub fn main() {
     b'\x0Z';  //~ ERROR invalid character in numeric character escape: `Z`
     b'	';  //~ ERROR byte constant must be escaped
     b''';  //~ ERROR byte constant must be escaped
-    b'é';  //~ ERROR non-ASCII character in byte constant
+    b'é';  //~ ERROR non-ASCII character in byte literal
     b'a  //~ ERROR unterminated byte constant [E0763]
 }
diff --git a/src/test/ui/parser/byte-literals.stderr b/src/test/ui/parser/byte-literals.stderr
index c3d00061630..efa55ae05bd 100644
--- a/src/test/ui/parser/byte-literals.stderr
+++ b/src/test/ui/parser/byte-literals.stderr
@@ -32,11 +32,11 @@ error: byte constant must be escaped: `'`
 LL |     b''';
    |       ^ help: escape the character: `\'`
 
-error: non-ASCII character in byte constant
+error: non-ASCII character in byte literal
   --> $DIR/byte-literals.rs:10:7
    |
 LL |     b'é';
-   |       ^ byte constant must be ASCII
+   |       ^ must be ASCII
    |
 help: if you meant to use the unicode code point for 'é', use a \xHH escape
    |
diff --git a/src/test/ui/parser/byte-string-literals.rs b/src/test/ui/parser/byte-string-literals.rs
index b1f11024a7b..30a4f50c4e4 100644
--- a/src/test/ui/parser/byte-string-literals.rs
+++ b/src/test/ui/parser/byte-string-literals.rs
@@ -3,7 +3,7 @@ static FOO: &'static [u8] = b"\f";  //~ ERROR unknown byte escape
 pub fn main() {
     b"\f";  //~ ERROR unknown byte escape
     b"\x0Z";  //~ ERROR invalid character in numeric character escape: `Z`
-    b"é";  //~ ERROR non-ASCII character in byte constant
-    br##"é"##;  //~ ERROR raw byte string must be ASCII
+    b"é";  //~ ERROR non-ASCII character in byte string literal
+    br##"é"##;  //~ ERROR non-ASCII character in raw byte string literal
     b"a  //~ ERROR unterminated double quote byte string
 }
diff --git a/src/test/ui/parser/byte-string-literals.stderr b/src/test/ui/parser/byte-string-literals.stderr
index 3b8b3692e05..5b96cc3d18a 100644
--- a/src/test/ui/parser/byte-string-literals.stderr
+++ b/src/test/ui/parser/byte-string-literals.stderr
@@ -20,18 +20,18 @@ error: invalid character in numeric character escape: `Z`
 LL |     b"\x0Z";
    |          ^ invalid character in numeric character escape
 
-error: non-ASCII character in byte constant
+error: non-ASCII character in byte string literal
   --> $DIR/byte-string-literals.rs:6:7
    |
 LL |     b"é";
-   |       ^ byte constant must be ASCII
+   |       ^ must be ASCII
    |
 help: if you meant to use the unicode code point for 'é', use a \xHH escape
    |
 LL |     b"\xE9";
    |       ~~~~
 
-error: raw byte string must be ASCII
+error: non-ASCII character in raw byte string literal
   --> $DIR/byte-string-literals.rs:7:10
    |
 LL |     br##"é"##;
diff --git a/src/test/ui/parser/raw/raw-byte-string-literals.rs b/src/test/ui/parser/raw/raw-byte-string-literals.rs
index 163c8ac66b0..1b859fee596 100644
--- a/src/test/ui/parser/raw/raw-byte-string-literals.rs
+++ b/src/test/ui/parser/raw/raw-byte-string-literals.rs
@@ -2,6 +2,6 @@
 
 pub fn main() {
     br"a
"; //~ ERROR bare CR not allowed in raw string
-    br"é";  //~ ERROR raw byte string must be ASCII
+    br"é";  //~ ERROR non-ASCII character in raw byte string literal
     br##~"a"~##;  //~ ERROR only `#` is allowed in raw string delimitation
 }
diff --git a/src/test/ui/parser/raw/raw-byte-string-literals.stderr b/src/test/ui/parser/raw/raw-byte-string-literals.stderr
index cfc877104bd..a2f27d1ed70 100644
--- a/src/test/ui/parser/raw/raw-byte-string-literals.stderr
+++ b/src/test/ui/parser/raw/raw-byte-string-literals.stderr
@@ -4,7 +4,7 @@ error: bare CR not allowed in raw string
 LL |     br"a
";
    |         ^
 
-error: raw byte string must be ASCII
+error: non-ASCII character in raw byte string literal
   --> $DIR/raw-byte-string-literals.rs:5:8
    |
 LL |     br"é";
diff --git a/src/test/ui/parser/unicode-control-codepoints.rs b/src/test/ui/parser/unicode-control-codepoints.rs
index 5af0b585a12..df099bb62ad 100644
--- a/src/test/ui/parser/unicode-control-codepoints.rs
+++ b/src/test/ui/parser/unicode-control-codepoints.rs
@@ -14,15 +14,15 @@ fn main() {
     println!("{:?}", r##"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only "##);
     //~^ ERROR unicode codepoint changing visible direction of text present in literal
     println!("{:?}", b"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only ");
-    //~^ ERROR non-ASCII character in byte constant
-    //~| ERROR non-ASCII character in byte constant
-    //~| ERROR non-ASCII character in byte constant
-    //~| ERROR non-ASCII character in byte constant
+    //~^ ERROR non-ASCII character in byte string literal
+    //~| ERROR non-ASCII character in byte string literal
+    //~| ERROR non-ASCII character in byte string literal
+    //~| ERROR non-ASCII character in byte string literal
     println!("{:?}", br##"/*‮ } ⁦if isAdmin⁩ ⁦ begin admins only "##);
-    //~^ ERROR raw byte string must be ASCII
-    //~| ERROR raw byte string must be ASCII
-    //~| ERROR raw byte string must be ASCII
-    //~| ERROR raw byte string must be ASCII
+    //~^ ERROR non-ASCII character in raw byte string literal
+    //~| ERROR non-ASCII character in raw byte string literal
+    //~| ERROR non-ASCII character in raw byte string literal
+    //~| ERROR non-ASCII character in raw byte string literal
     println!("{:?}", '‮');
     //~^ ERROR unicode codepoint changing visible direction of text present in literal
 }
diff --git a/src/test/ui/parser/unicode-control-codepoints.stderr b/src/test/ui/parser/unicode-control-codepoints.stderr
index 44548c72ff5..fc071a94191 100644
--- a/src/test/ui/parser/unicode-control-codepoints.stderr
+++ b/src/test/ui/parser/unicode-control-codepoints.stderr
@@ -14,69 +14,69 @@ LL |     println!("{:?}", b"us\u{202B}e\u{202A}r");
    |
    = help: unicode escape sequences cannot be used as a byte or in a byte string
 
-error: non-ASCII character in byte constant
+error: non-ASCII character in byte string literal
   --> $DIR/unicode-control-codepoints.rs:16:26
    |
 LL |     println!("{:?}", b"/* } if isAdmin  begin admins only ");
-   |                          ^ byte constant must be ASCII but is '\u{202e}'
+   |                          ^ must be ASCII but is '\u{202e}'
    |
 help: if you meant to use the UTF-8 encoding of '\u{202e}', use \xHH escapes
    |
 LL |     println!("{:?}", b"/*\xE2\x80\xAE } if isAdmin  begin admins only ");
    |                          ~~~~~~~~~~~~
 
-error: non-ASCII character in byte constant
+error: non-ASCII character in byte string literal
   --> $DIR/unicode-control-codepoints.rs:16:30
    |
 LL |     println!("{:?}", b"/* } if isAdmin  begin admins only ");
-   |                             ^ byte constant must be ASCII but is '\u{2066}'
+   |                             ^ must be ASCII but is '\u{2066}'
    |
 help: if you meant to use the UTF-8 encoding of '\u{2066}', use \xHH escapes
    |
 LL |     println!("{:?}", b"/* } \xE2\x81\xA6if isAdmin  begin admins only ");
    |                             ~~~~~~~~~~~~
 
-error: non-ASCII character in byte constant
+error: non-ASCII character in byte string literal
   --> $DIR/unicode-control-codepoints.rs:16:41
    |
 LL |     println!("{:?}", b"/* } if isAdmin  begin admins only ");
-   |                                       ^ byte constant must be ASCII but is '\u{2069}'
+   |                                       ^ must be ASCII but is '\u{2069}'
    |
 help: if you meant to use the UTF-8 encoding of '\u{2069}', use \xHH escapes
    |
 LL |     println!("{:?}", b"/* } if isAdmin\xE2\x81\xA9  begin admins only ");
    |                                       ~~~~~~~~~~~~
 
-error: non-ASCII character in byte constant
+error: non-ASCII character in byte string literal
   --> $DIR/unicode-control-codepoints.rs:16:43
    |
 LL |     println!("{:?}", b"/* } if isAdmin  begin admins only ");
-   |                                        ^ byte constant must be ASCII but is '\u{2066}'
+   |                                        ^ must be ASCII but is '\u{2066}'
    |
 help: if you meant to use the UTF-8 encoding of '\u{2066}', use \xHH escapes
    |
 LL |     println!("{:?}", b"/* } if isAdmin \xE2\x81\xA6 begin admins only ");
    |                                        ~~~~~~~~~~~~
 
-error: raw byte string must be ASCII
+error: non-ASCII character in raw byte string literal
   --> $DIR/unicode-control-codepoints.rs:21:29
    |
 LL |     println!("{:?}", br##"/* } if isAdmin  begin admins only "##);
    |                             ^ must be ASCII but is '\u{202e}'
 
-error: raw byte string must be ASCII
+error: non-ASCII character in raw byte string literal
   --> $DIR/unicode-control-codepoints.rs:21:33
    |
 LL |     println!("{:?}", br##"/* } if isAdmin  begin admins only "##);
    |                                ^ must be ASCII but is '\u{2066}'
 
-error: raw byte string must be ASCII
+error: non-ASCII character in raw byte string literal
   --> $DIR/unicode-control-codepoints.rs:21:44
    |
 LL |     println!("{:?}", br##"/* } if isAdmin  begin admins only "##);
    |                                          ^ must be ASCII but is '\u{2069}'
 
-error: raw byte string must be ASCII
+error: non-ASCII character in raw byte string literal
   --> $DIR/unicode-control-codepoints.rs:21:46
    |
 LL |     println!("{:?}", br##"/* } if isAdmin  begin admins only "##);