("no-landing-pads", "omit landing pads for unwinding",
NO_LANDING_PADS),
("debug-llvm", "enable debug output from LLVM", DEBUG_LLVM),
- ("show-span", "show spans", SHOW_SPAN),
+ ("show-span", "show spans for compiler debugging", SHOW_SPAN),
("count-type-sizes", "count the sizes of aggregate types",
COUNT_TYPE_SIZES),
("meta-stats", "gather metadata statistics", META_STATS),
// option. This file may not be copied, modified, or distributed
// except according to those terms.
+//! Span debugger
+//!
+//! This module shows spans for all expressions in the crate
+//! to help with compiler debugging.
+
use syntax::ast;
use syntax::visit;
use syntax::visit::Visitor;