diff --git a/framework/src/main/java/org/checkerframework/common/basetype/BaseTypeVisitor.java b/framework/src/main/java/org/checkerframework/common/basetype/BaseTypeVisitor.java
index 7a9986ab6e..4af77ac8fd 100644
--- a/framework/src/main/java/org/checkerframework/common/basetype/BaseTypeVisitor.java
+++ b/framework/src/main/java/org/checkerframework/common/basetype/BaseTypeVisitor.java
@@ -222,6 +222,8 @@ public class BaseTypeVisitor<Factory extends GenericAnnotatedTypeFactory<?, ?, ?
 
   /** True if "-Ashowchecks" was passed on the command line. */
   private final boolean showchecks;
+  /** True if "-AshowTypes" was passed on the command line. */
+  private final boolean showTypes;
   /** True if "-Ainfer" was passed on the command line. */
   private final boolean infer;
   /** True if "-AsuggestPureMethods" or "-Ainfer" was passed on the command line. */
@@ -268,6 +270,7 @@ protected BaseTypeVisitor(BaseTypeChecker checker, Factory typeFactory) {
     targetValueElement = TreeUtils.getMethod(Target.class, "value", 0, env);
     unusedWhenElement = TreeUtils.getMethod(Unused.class, "when", 0, env);
     showchecks = checker.hasOption("showchecks");
+    showTypes = checker.hasOption("showTypes");
     infer = checker.hasOption("infer");
     suggestPureMethods = checker.hasOption("suggestPureMethods") || infer;
     checkPurity = checker.hasOption("checkPurityAnnotations") || suggestPureMethods;
@@ -2849,6 +2852,9 @@ protected final void commonAssignmentCheckStartDiagnostic(
           varType.getKind(),
           varType.toString());
     }
+    if (showTypes) {
+      checker.reportWarning(valueTree, "sourceType", valueType, valueTree);
+    }
   }
 
   /**
diff --git a/framework/src/main/java/org/checkerframework/framework/source/SourceChecker.java b/framework/src/main/java/org/checkerframework/framework/source/SourceChecker.java
index fa95d8b8e8..b8fef1946c 100644
--- a/framework/src/main/java/org/checkerframework/framework/source/SourceChecker.java
+++ b/framework/src/main/java/org/checkerframework/framework/source/SourceChecker.java
@@ -331,6 +331,11 @@
   // org.checkerframework.common.basetype.BaseTypeVisitor
   "showchecks",
 
+  // Emit a diagnostic showing the type of each expression whose value is used and each receiver of
+  // an expression, including assignments and method argument slots.
+  // org.checkerframework.common.basetype.BaseTypeVisitor
+  "showTypes",
+
   // Output information about intermediate steps in method type argument inference
   // org.checkerframework.framework.util.typeinference.DefaultTypeArgumentInference
   "showInferenceSteps",