diff --git a/docs/src/optanalysis.md b/docs/src/optanalysis.md
index ae17c6948..0ea1c2628 100644
--- a/docs/src/optanalysis.md
+++ b/docs/src/optanalysis.md
@@ -175,6 +175,10 @@ report = @report_opt sumup(sin);
 rpts = JET.get_reports(report)
 ```
 
+!!! tip
+    If `rpts` is a long list, consider using `urpts = unique(reportkey, rpts)` to trim it.
+    See [`reportkey`](@ref).
+
 Now you can `ascend` individual reports:
 
 ```
diff --git a/src/JET.jl b/src/JET.jl
index ed823d7b3..a97d82274 100644
--- a/src/JET.jl
+++ b/src/JET.jl
@@ -6,7 +6,7 @@ module JET
 export
     # jetanalyzer
     @report_call, report_call, @test_call, test_call,
-    report_file, test_file, report_package, test_package, report_text, test_text,
+    report_file, test_file, report_package, test_package, report_text, reportkey, test_text,
     watch_file,
     # optanalyzer
     @report_opt, report_opt, @test_opt, test_opt,
diff --git a/src/abstractinterpret/inferenceerrorreport.jl b/src/abstractinterpret/inferenceerrorreport.jl
index cd0c59771..ecec9e5c0 100644
--- a/src/abstractinterpret/inferenceerrorreport.jl
+++ b/src/abstractinterpret/inferenceerrorreport.jl
@@ -580,6 +580,16 @@ end
 # utility
 # -------
 
+"""
+    reportkey(report::InferenceErrorReport)
+
+Returns an identifier for the runtime-dispatched call site of `report`.
+
+If you have a long list of reports to analyze, `urpts = unique(reportkey, rpts)` may remove "duplicates"
+that arrive at the same runtime dispatch from different entry points.
+"""
+reportkey(report::InferenceErrorReport) = (report.sig.tt, report.vst[end].linfo)
+
 # TODO parametric definition?
 
 """