Add arithmetic error reporting for MathInterpreter

spec/compiler/semantic/enum_spec.cr

@@ -314,6 +314,14 @@ describe "Semantic: enum" do
       CRYSTAL
   end
 
+  it "reports arithmetic overflow in enum value expression (#11746)" do
+    assert_error <<-CRYSTAL, "Arithmetic overflow", inject_primitives: true
+      enum Foo : UInt64
+        A = 0_u64 - 1_u64
+      end
+      CRYSTAL
+  end
+
   it "errors if using instance var inside enum (#991)" do
     assert_error <<-CRYSTAL, "can't use instance variables inside enums (at enum Foo)"
       enum Foo

spec/compiler/semantic/static_array_spec.cr

@@ -177,4 +177,11 @@ describe "Semantic: static array" do
       alias BadArray = Int32[offsetof(Foo, @foo)]
       CRYSTAL
   end
+
+  it "reports arithmetic overflow in static array size argument (#11746)" do
+    assert_error <<-CRYSTAL, "Arithmetic overflow", inject_primitives: true
+      A = 0_u64 - 1_u64
+      b = StaticArray(Int32, A).new
+      CRYSTAL
+  end
 end

src/compiler/crystal/semantic/math_interpreter.cr

@@ -86,6 +86,8 @@ struct Crystal::MathInterpreter
     else
       interpret_call_macro(node)
     end
+  rescue ex : OverflowError | DivisionByZeroError
+    node.raise ex.message
   end
 
   def interpret_call_macro(node : Call)