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-rw-r--r--compiler/rustc_lexer/src/lib.rs8
1 files changed, 6 insertions, 2 deletions
diff --git a/compiler/rustc_lexer/src/lib.rs b/compiler/rustc_lexer/src/lib.rs
index d4140cb295f..3fbabbc6344 100644
--- a/compiler/rustc_lexer/src/lib.rs
+++ b/compiler/rustc_lexer/src/lib.rs
@@ -167,11 +167,15 @@ pub enum DocStyle {
     Inner,
 }
 
+// Note that the suffix is *not* considered when deciding the `LiteralKind` in
+// this type. This means that float literals like `1f32` are classified by this
+// type as `Int`. (Compare against `rustc_ast::token::LitKind` and
+// `rustc_ast::ast::LitKind.)
 #[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)]
 pub enum LiteralKind {
-    /// "12_u8", "0o100", "0b120i99"
+    /// "12_u8", "0o100", "0b120i99", "1f32".
     Int { base: Base, empty_int: bool },
-    /// "12.34f32", "0b100.100"
+    /// "12.34f32", "1e3", but not "1f32`.
     Float { base: Base, empty_exponent: bool },
     /// "'a'", "'\\'", "'''", "';"
     Char { terminated: bool },