Add an Option<Span> argument to span_lint_and_help.

Author: xiongmao86

clippy_lints/src/as_conversions.rs

@@ -50,6 +50,7 @@ impl EarlyLintPass for AsConversions {
                 AS_CONVERSIONS,
                 expr.span,
                 "using a potentially dangerous silent `as` conversion",
+                None,
                 "consider using a safe wrapper for this conversion",
             );
         }

clippy_lints/src/assertions_on_constants.rs

@@ -41,6 +41,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for AssertionsOnConstants {
                 } else {
                     "`assert!(true)` will be optimized out by the compiler"
                 },
+                None,
                 "remove it",
             );
         };
@@ -50,6 +51,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for AssertionsOnConstants {
                 ASSERTIONS_ON_CONSTANTS,
                 e.span,
                 "`assert!(false)` should probably be replaced",
+                None,
                 "use `panic!()` or `unreachable!()`",
             );
         };
@@ -59,6 +61,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for AssertionsOnConstants {
                 ASSERTIONS_ON_CONSTANTS,
                 e.span,
                 &format!("`assert!(false, {})` should probably be replaced", panic_message),
+                None,
                 &format!("use `panic!({})` or `unreachable!({})`", panic_message, panic_message),
             )
         };

clippy_lints/src/atomic_ordering.rs

@@ -85,6 +85,7 @@ fn check_atomic_load_store(cx: &LateContext<'_, '_>, expr: &Expr<'_>) {
                     INVALID_ATOMIC_ORDERING,
                     ordering_arg.span,
                     "atomic loads cannot have `Release` and `AcqRel` ordering",
+                    None,
                     "consider using ordering modes `Acquire`, `SeqCst` or `Relaxed`"
                 );
             } else if method == "store" &&
@@ -94,6 +95,7 @@ fn check_atomic_load_store(cx: &LateContext<'_, '_>, expr: &Expr<'_>) {
                     INVALID_ATOMIC_ORDERING,
                     ordering_arg.span,
                     "atomic stores cannot have `Acquire` and `AcqRel` ordering",
+                    None,
                     "consider using ordering modes `Release`, `SeqCst` or `Relaxed`"
                 );
             }
@@ -118,6 +120,7 @@ fn check_memory_fence(cx: &LateContext<'_, '_>, expr: &Expr<'_>) {
                 INVALID_ATOMIC_ORDERING,
                 args[0].span,
                 "memory fences cannot have `Relaxed` ordering",
+                None,
                 "consider using ordering modes `Acquire`, `Release`, `AcqRel` or `SeqCst`"
             );
         }

clippy_lints/src/cognitive_complexity.rs

@@ -105,6 +105,7 @@ impl CognitiveComplexity {
                     rust_cc,
                     self.limit.limit()
                 ),
+                None,
                 "you could split it up into multiple smaller functions",
             );
         }

clippy_lints/src/comparison_chain.rs

@@ -104,6 +104,7 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for ComparisonChain {
             COMPARISON_CHAIN,
             expr.span,
             "`if` chain can be rewritten with `match`",
+            None,
             "Consider rewriting the `if` chain to use `cmp` and `match`.",
         )
     }

clippy_lints/src/dbg_macro.rs

@@ -48,6 +48,7 @@ impl EarlyLintPass for DbgMacro {
                     DBG_MACRO,
                     mac.span(),
                     "`dbg!` macro is intended as a debugging tool",
+                    None,
                     "ensure to avoid having uses of it in version control",
                 );
             }

clippy_lints/src/else_if_without_else.rs

@@ -61,6 +61,7 @@ impl EarlyLintPass for ElseIfWithoutElse {
                     ELSE_IF_WITHOUT_ELSE,
                     els.span,
                     "`if` expression with an `else if`, but without a final `else`",
+                    None,
                     "add an `else` block here",
                 );
             }

clippy_lints/src/empty_enum.rs

@@ -45,13 +45,14 @@ impl<'a, 'tcx> LateLintPass<'a, 'tcx> for EmptyEnum {
             let ty = cx.tcx.type_of(did);
             let adt = ty.ty_adt_def().expect("already checked whether this is an enum");
             if adt.variants.is_empty() {
-                span_lint_and_then(
+                span_lint_and_help(
                     cx,
                     EMPTY_ENUM,
                     item.span,
                     "enum with no variants",
-                    "consider using the uninhabited type `!` (never type) or a wrapper around it \
-                    to introduce a type which can't be instantiated",
+                    Some(item.span),
+                    "consider using the uninhabited type `!` (never type) or a wrapper \
+                    around it to introduce a type which can't be instantiated",
                 );
             }
         }

clippy_lints/src/enum_variants.rs

@@ -206,6 +206,7 @@ fn check_variant(
         lint,
         span,
         &format!("All variants have the same {}fix: `{}`", what, value),
+        None,
         &format!(
             "remove the {}fixes and use full paths to \
              the variants instead of glob imports",

clippy_lints/src/excessive_bools.rs

@@ -114,6 +114,7 @@ impl ExcessiveBools {
                 FN_PARAMS_EXCESSIVE_BOOLS,
                 span,
                 &format!("more than {} bools in function parameters", self.max_fn_params_bools),
+                None,
                 "consider refactoring bools into two-variant enums",
             );
         }
@@ -153,6 +154,7 @@ impl EarlyLintPass for ExcessiveBools {
                         STRUCT_EXCESSIVE_BOOLS,
                         item.span,
                         &format!("more than {} bools in a struct", self.max_struct_bools),
+                        None,
                         "consider using a state machine or refactoring bools into two-variant enums",
                     );
                 }