Add smoke test thing to save me from testing

smoke.rs

@@ -0,0 +1,101 @@
+// Keywords
+// --------
+
+  abstract, alignof, as, become, box, break, const, continue, crate, do, else, enum,
+  extern, false, final, fn, for, if, impl, in, let, loop, macro, match, mod, move, mut,
+  offsetof, override, priv, pub, pure, ref, return, sizeof, static, self, struct, super,
+  true, trait, type, typeof, unsafe, unsized, use, virtual, where, while, yield.
+
+// Types
+// -----
+
+  - ()
+  - bool, char, str
+  - u8, u16, u32, u64
+  - i8, i16, i32, i64
+  - f32, f64
+  - usize, isize
+
+  - int, uint    // these are no longer valid!
+
+// Comments
+// --------
+
+  // This is a comment
+  /* So is this */
+
+  /// This is a doc comment
+  /** So is this */
+
+// Characters and Lifetimes
+// ------------------------
+
+  'a'        // a character
+  'a         // a lifetime
+  'static    // also a lifetime
+  b'a'       // a byte
+
+  ' '        // this is also a character (space)
+  '\t'       // characters can be escaped
+  '\''       // including the quote character itself!
+
+  "geese"          // a string
+  r##"geese"##     // a raw string. This part should not be highlighted!
+  b"geese"         // a byte string
+  br##"geese"##    // a raw byte string. This part should still not be highlighted
+
+  "there's a \" in this string"  // be sure to handle escapes
+  "\"geese\""                    // including at the edges
+
+  r##"there's a " in this string"##  // the string shouldn't end until ##
+  r##"there's a # in this string"##  // even if there's a # in the middle
+
+// Decimal Numbers
+// ---------------
+
+  7, 12, 1048576    // are all numbers
+  1_000_000         // is a number with underscore separators
+  _, _1000, 1000_   // beware of sole/leading/trailing underscores
+
+// Hex Numbers
+// -----------
+
+  0xff              // hex numbers start with 0x
+  0xFF              // and can be in lowercase or uppercase
+  0x0123_4567       // and can have separators
+
+// Octal Numbers
+// -------------
+
+  0o77              // octal numbers start with 0o
+  0o12345678909     // and should finish after an 8 or 9
+
+// Binary Numbers
+// --------------
+
+  0b0000_1111       // binary numbers start with 0b
+  0b01234311        // and should finish after a 2 or higher
+
+// Floating-Point Numbers
+// ----------------------
+
+  6.022E-23         // floating point notation
+  5.974e24          // lowercase e
+  7.348e+22         // uppercase E and plus
+
+  let tuple = ((8, 4), 48);
+  let a = tuple.1.1
+
+// Numeric Suffixes
+// ----------------
+
+  123i32,  123u32   // numbers can have literals
+  123_u32, 0xff_u8
+  0o70_i16, 0b1111_1111_1001_0000_i32
+  0us, 7is
+
+  123.0f64
+  0.1f64
+  0.1f32
+  12E+99_f64
+  2.f64  // Invalid!