diff --git a/clippy_lints/src/float_literal.rs b/clippy_lints/src/float_literal.rs
index 38a16c5c8b0..cffca952e47 100644
--- a/clippy_lints/src/float_literal.rs
+++ b/clippy_lints/src/float_literal.rs
@@ -81,6 +81,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
                 LitFloatType::Unsuffixed => None,
             };
             let (is_whole, is_inf, mut float_str) = match fty {
+                FloatTy::F16 => unimplemented!("f16_f128"),
                 FloatTy::F32 => {
                     let value = sym_str.parse::<f32>().unwrap();
 
@@ -91,6 +92,7 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
 
                     (value.fract() == 0.0, value.is_infinite(), formatter.format(value))
                 },
+                FloatTy::F128 => unimplemented!("f16_f128"),
             };
 
             if is_inf {
@@ -135,8 +137,10 @@ fn check_expr(&mut self, cx: &LateContext<'tcx>, expr: &'tcx hir::Expr<'_>) {
 #[must_use]
 fn max_digits(fty: FloatTy) -> u32 {
     match fty {
+        FloatTy::F16 => unimplemented!("f16_f128"),
         FloatTy::F32 => f32::DIGITS,
         FloatTy::F64 => f64::DIGITS,
+        FloatTy::F128 => unimplemented!("f16_f128"),
     }
 }
 
diff --git a/clippy_utils/src/consts.rs b/clippy_utils/src/consts.rs
index 79c691992a8..1f2b2d54efd 100644
--- a/clippy_utils/src/consts.rs
+++ b/clippy_utils/src/consts.rs
@@ -778,8 +778,10 @@ pub fn mir_to_const<'tcx>(lcx: &LateContext<'tcx>, result: mir::Const<'tcx>) ->
                 let range = alloc_range(offset + size * idx, size);
                 let val = alloc.read_scalar(&lcx.tcx, range, /* read_provenance */ false).ok()?;
                 res.push(match flt {
+                    FloatTy::F16 => unimplemented!("f16_f128"),
                     FloatTy::F32 => Constant::F32(f32::from_bits(val.to_u32().ok()?)),
                     FloatTy::F64 => Constant::F64(f64::from_bits(val.to_u64().ok()?)),
+                    FloatTy::F128 => unimplemented!("f16_f128"),
                 });
             }
             Some(Constant::Vec(res))