Implement a suggestions mechanism

Each `Error` class now includes a set of suggestions, and these are printed by
the top-level handler.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/libutil/error.hh b/src/libutil/error.hh
index d55e1d701..600e94888 100644
--- a/src/libutil/error.hh
+++ b/src/libutil/error.hh
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "suggestions.hh"
 #include "ref.hh"
 #include "types.hh"
 #include "fmt.hh"
@@ -112,6 +113,8 @@ struct ErrorInfo {
     std::optional<ErrPos> errPos;
     std::list<Trace> traces;
 
+    Suggestions suggestions;
+
     static std::optional<std::string> programName;
 };
 
@@ -141,6 +144,11 @@ public:
         : err { .level = lvlError, .msg = hintfmt(fs, args...) }
     { }
 
+    template<typename... Args>
+    BaseError(const Suggestions & sug, const Args & ... args)
+        : err { .level = lvlError, .msg = hintfmt(args...), .suggestions = sug }
+    { }
+
     BaseError(hintformat hint)
         : err { .level = lvlError, .msg = hint }
     { }