Move {hir::lowering -> hir}::is_range_literal.

The function is never used inside lowering,
but only ever in external crates.

By moving it, we faciliate lowering as its own crate.

src/librustc/hir/lowering.rs

@@ -3437,65 +3437,3 @@ fn body_ids(bodies: &BTreeMap<hir::BodyId, hir::Body<'hir>>) -> Vec<hir::BodyId>
     body_ids.sort_by_key(|b| bodies[b].value.span);
     body_ids
 }
-
-/// Checks if the specified expression is a built-in range literal.
-/// (See: `LoweringContext::lower_expr()`).
-pub fn is_range_literal(sess: &Session, expr: &hir::Expr) -> bool {
-    use hir::{Path, QPath, ExprKind, TyKind};
-
-    // Returns whether the given path represents a (desugared) range,
-    // either in std or core, i.e. has either a `::std::ops::Range` or
-    // `::core::ops::Range` prefix.
-    fn is_range_path(path: &Path) -> bool {
-        let segs: Vec<_> = path.segments.iter().map(|seg| seg.ident.to_string()).collect();
-        let segs: Vec<_> = segs.iter().map(|seg| &**seg).collect();
-
-        // "{{root}}" is the equivalent of `::` prefix in `Path`.
-        if let ["{{root}}", std_core, "ops", range] = segs.as_slice() {
-            (*std_core == "std" || *std_core == "core") && range.starts_with("Range")
-        } else {
-            false
-        }
-    };
-
-    // Check whether a span corresponding to a range expression is a
-    // range literal, rather than an explicit struct or `new()` call.
-    fn is_lit(sess: &Session, span: &Span) -> bool {
-        let source_map = sess.source_map();
-        let end_point = source_map.end_point(*span);
-
-        if let Ok(end_string) = source_map.span_to_snippet(end_point) {
-            !(end_string.ends_with("}") || end_string.ends_with(")"))
-        } else {
-            false
-        }
-    };
-
-    match expr.kind {
-        // All built-in range literals but `..=` and `..` desugar to `Struct`s.
-        ExprKind::Struct(ref qpath, _, _) => {
-            if let QPath::Resolved(None, ref path) = **qpath {
-                return is_range_path(&path) && is_lit(sess, &expr.span);
-            }
-        }
-
-        // `..` desugars to its struct path.
-        ExprKind::Path(QPath::Resolved(None, ref path)) => {
-            return is_range_path(&path) && is_lit(sess, &expr.span);
-        }
-
-        // `..=` desugars into `::std::ops::RangeInclusive::new(...)`.
-        ExprKind::Call(ref func, _) => {
-            if let ExprKind::Path(QPath::TypeRelative(ref ty, ref segment)) = func.kind {
-                if let TyKind::Path(QPath::Resolved(None, ref path)) = ty.kind {
-                    let new_call = segment.ident.name == sym::new;
-                    return is_range_path(&path) && is_lit(sess, &expr.span) && new_call;
-                }
-            }
-        }
-
-        _ => {}
-    }
-
-    false
-}

src/librustc/hir/mod.rs

@@ -1564,6 +1564,68 @@ impl fmt::Debug for Expr {
     }
 }
 
+/// Checks if the specified expression is a built-in range literal.
+/// (See: `LoweringContext::lower_expr()`).
+pub fn is_range_literal(sess: &Session, expr: &hir::Expr) -> bool {
+    use hir::{Path, QPath, ExprKind, TyKind};
+
+    // Returns whether the given path represents a (desugared) range,
+    // either in std or core, i.e. has either a `::std::ops::Range` or
+    // `::core::ops::Range` prefix.
+    fn is_range_path(path: &Path) -> bool {
+        let segs: Vec<_> = path.segments.iter().map(|seg| seg.ident.to_string()).collect();
+        let segs: Vec<_> = segs.iter().map(|seg| &**seg).collect();
+
+        // "{{root}}" is the equivalent of `::` prefix in `Path`.
+        if let ["{{root}}", std_core, "ops", range] = segs.as_slice() {
+            (*std_core == "std" || *std_core == "core") && range.starts_with("Range")
+        } else {
+            false
+        }
+    };
+
+    // Check whether a span corresponding to a range expression is a
+    // range literal, rather than an explicit struct or `new()` call.
+    fn is_lit(sess: &Session, span: &Span) -> bool {
+        let source_map = sess.source_map();
+        let end_point = source_map.end_point(*span);
+
+        if let Ok(end_string) = source_map.span_to_snippet(end_point) {
+            !(end_string.ends_with("}") || end_string.ends_with(")"))
+        } else {
+            false
+        }
+    };
+
+    match expr.kind {
+        // All built-in range literals but `..=` and `..` desugar to `Struct`s.
+        ExprKind::Struct(ref qpath, _, _) => {
+            if let QPath::Resolved(None, ref path) = **qpath {
+                return is_range_path(&path) && is_lit(sess, &expr.span);
+            }
+        }
+
+        // `..` desugars to its struct path.
+        ExprKind::Path(QPath::Resolved(None, ref path)) => {
+            return is_range_path(&path) && is_lit(sess, &expr.span);
+        }
+
+        // `..=` desugars into `::std::ops::RangeInclusive::new(...)`.
+        ExprKind::Call(ref func, _) => {
+            if let ExprKind::Path(QPath::TypeRelative(ref ty, ref segment)) = func.kind {
+                if let TyKind::Path(QPath::Resolved(None, ref path)) = ty.kind {
+                    let new_call = segment.ident.name == sym::new;
+                    return is_range_path(&path) && is_lit(sess, &expr.span) && new_call;
+                }
+            }
+        }
+
+        _ => {}
+    }
+
+    false
+}
+
 #[derive(RustcEncodable, RustcDecodable, Debug, HashStable)]
 pub enum ExprKind {
     /// A `box x` expression.