Looks like gdb supports Nim - then so does Seer!

tests/hellonim/.gitignore

@@ -0,0 +1 @@
+hellonim

tests/hellonim/Makefile

@@ -0,0 +1,10 @@
+.PHONY: all
+all: hellonim
+
+hellonim: hellonim.nim
+	nim c --debugger:native hellonim.nim
+
+.PHONY: clean
+clean:
+	rm -f hellonim
+

tests/hellonim/hellonim.nim

@@ -0,0 +1,35 @@
+type
+  TestObj = object
+    num: int
+    val: float
+    str: string
+
+proc initTestObj(num: int): TestObj =
+  TestObj(num: num, val: 3.141, str: "TestObj")
+
+proc foo(x: int): int =
+  let y = x + 2
+  return y * 10
+
+proc bar(x: int): int =
+  if x == 3:
+    return foo(x)
+  return x * 100
+
+proc main =
+  var a = 1
+  a += 3
+  let str = "foobar"
+  var seq1 = @[0, 1, 2, 3, 4]
+  a = bar(1)
+  a = bar(2)
+  a = bar(3)
+  let tobj = initTestObj(11)
+
+main()
+
+# A simple Nim program.
+# https://internet-of-tomohiro.netlify.app/nim/gdb.en.html
+# https://forum.nim-lang.org/t/11214
+
+

tests/hellonim/project.seer

@@ -0,0 +1,25 @@
+{
+    "seerproject": {
+        "executable": "hellonim",
+        "postgdbcommands": [
+            ""
+        ],
+        "pregdbcommands": [
+            "skip -gfile lib/system.nim",
+            "skip -gfile lib/system/*.nim"
+        ],
+        "startmode": {
+            "arguments": "",
+            "breakinfunction": false,
+            "breakinfunctionname": "",
+            "breakinmain": true,
+            "breakpointsfile": "",
+            "nobreak": false,
+            "nonstopmode": false,
+            "randomizestartaddress": false,
+            "showassemblytab": false
+        },
+        "symbolfile": "",
+        "workingdirectory": ""
+    }
+}