src/librustc_mir/util/mod.rs

   1 use core::unicode::property::Pattern_White_Space;
   2 use rustc::ty;
   3 use syntax_pos::Span;
   4
   5 pub mod borrowck_errors;
   6 pub mod elaborate_drops;
   7 pub mod def_use;
   8 pub mod patch;
   9
  10 mod alignment;
  11 mod graphviz;
  12 pub(crate) mod pretty;
  13 pub mod liveness;
  14 pub mod collect_writes;
  15
  16 pub use self::alignment::is_disaligned;
  17 pub use self::pretty::{dump_enabled, dump_mir, write_mir_pretty, PassWhere};
  18 pub use self::graphviz::{graphviz_safe_def_name, write_mir_graphviz};
  19 pub use self::graphviz::write_node_label as write_graphviz_node_label;
  20
  21 /// If possible, suggest replacing `ref` with `ref mut`.
  22 pub fn suggest_ref_mut<'cx, 'gcx, 'tcx>(
  23     tcx: ty::TyCtxt<'cx, 'gcx, 'tcx>,
  24     binding_span: Span,
  25 ) -> Option<(String)> {
  26     let hi_src = tcx.sess.source_map().span_to_snippet(binding_span).unwrap();
  27     if hi_src.starts_with("ref")
  28         && hi_src["ref".len()..].starts_with(Pattern_White_Space)
  29     {
  30         let replacement = format!("ref mut{}", &hi_src["ref".len()..]);
  31         Some(replacement)
  32     } else {
  33         None
  34     }
  35 }