Add label for invalid literal suffix

Author: estebank

src/libsyntax/parse/mod.rs

@@ -520,6 +520,7 @@ fn filtered_float_lit(data: Symbol, suffix: Option<Symbol>, diag: Option<(Span,
                 } else {
                     let msg = format!("invalid suffix `{}` for float literal", suf);
                     diag.struct_span_err(span, &msg)
+                        .span_label(span, format!("invalid suffix `{}`", suf))
                         .help("valid suffixes are `f32` and `f64`")
                         .emit();
                 }
@@ -716,6 +717,7 @@ fn integer_lit(s: &str, suffix: Option<Symbol>, diag: Option<(Span, &Handler)>)
                     } else {
                         let msg = format!("invalid suffix `{}` for numeric literal", suf);
                         diag.struct_span_err(span, &msg)
+                            .span_label(span, format!("invalid suffix `{}`", suf))
                             .help("the suffix must be one of the integral types \
                                    (`u32`, `isize`, etc)")
                             .emit();

src/test/ui/old-suffixes-are-really-forbidden.stderr

@@ -2,15 +2,15 @@ error: invalid suffix `is` for numeric literal
   --> $DIR/old-suffixes-are-really-forbidden.rs:2:13
    |
 LL |     let a = 1_is; //~ ERROR invalid suffix
-   |             ^^^^
+   |             ^^^^ invalid suffix `is`
    |
    = help: the suffix must be one of the integral types (`u32`, `isize`, etc)
 
 error: invalid suffix `us` for numeric literal
   --> $DIR/old-suffixes-are-really-forbidden.rs:3:13
    |
 LL |     let b = 2_us; //~ ERROR invalid suffix
-   |             ^^^^
+   |             ^^^^ invalid suffix `us`
    |
    = help: the suffix must be one of the integral types (`u32`, `isize`, etc)
 

src/test/ui/parser/bad-lit-suffixes.stderr

@@ -82,31 +82,31 @@ error: invalid suffix `suffix` for numeric literal
   --> $DIR/bad-lit-suffixes.rs:25:5
    |
 LL |     1234suffix; //~ ERROR invalid suffix `suffix` for numeric literal
-   |     ^^^^^^^^^^
+   |     ^^^^^^^^^^ invalid suffix `suffix`
    |
    = help: the suffix must be one of the integral types (`u32`, `isize`, etc)
 
 error: invalid suffix `suffix` for numeric literal
   --> $DIR/bad-lit-suffixes.rs:26:5
    |
 LL |     0b101suffix; //~ ERROR invalid suffix `suffix` for numeric literal
-   |     ^^^^^^^^^^^
+   |     ^^^^^^^^^^^ invalid suffix `suffix`
    |
    = help: the suffix must be one of the integral types (`u32`, `isize`, etc)
 
 error: invalid suffix `suffix` for float literal
   --> $DIR/bad-lit-suffixes.rs:27:5
    |
 LL |     1.0suffix; //~ ERROR invalid suffix `suffix` for float literal
-   |     ^^^^^^^^^
+   |     ^^^^^^^^^ invalid suffix `suffix`
    |
    = help: valid suffixes are `f32` and `f64`
 
 error: invalid suffix `suffix` for float literal
   --> $DIR/bad-lit-suffixes.rs:28:5
    |
 LL |     1.0e10suffix; //~ ERROR invalid suffix `suffix` for float literal
-   |     ^^^^^^^^^^^^
+   |     ^^^^^^^^^^^^ invalid suffix `suffix`
    |
    = help: valid suffixes are `f32` and `f64`
 

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

@@ -14,7 +14,7 @@ error: invalid suffix `p4f64` for numeric literal
   --> $DIR/no-binary-float-literal.rs:6:5
    |
 LL |     0b101p4f64;
-   |     ^^^^^^^^^^
+   |     ^^^^^^^^^^ invalid suffix `p4f64`
    |
    = help: the suffix must be one of the integral types (`u32`, `isize`, etc)
 

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

@@ -8,7 +8,7 @@ error: invalid suffix `f` for float literal
   --> $DIR/no-hex-float-literal.rs:6:18
    |
 LL |     0xDEAD.BEEFp-2f;
-   |                  ^^
+   |                  ^^ invalid suffix `f`
    |
    = help: valid suffixes are `f32` and `f64`