Fix getting custom pragma from generic object (#20481)

* Merge devel

Add another test case

* Fix test

Use getCustomPragmaVal instead of hasCustomPragma

Co-authored-by: Clay Sweetser <Varriount@users.noreply.github.com>

lib/core/macros.nim

@@ -1591,7 +1591,7 @@ proc customPragmaNode(n: NimNode): NimNode =
     elif impl.kind in {nnkIdentDefs, nnkConstDef} and impl[0].kind == nnkPragmaExpr:
       return impl[0][1]
     else:
-      let timpl = typ.getImpl()
+      let timpl = getImpl(if typ.kind == nnkBracketExpr: typ[0] else: typ)
       if timpl.len>0 and timpl[0].len>1:
         return timpl[0][1]
       else:

tests/stdlib/tmacros.nim

@@ -157,3 +157,21 @@ block: # bug #19020
   static:
     doAssert $bar.getCustomPragmaVal(typ) == "foo"
   doAssert $bar.getCustomPragmaVal(typ) == "foo"
+
+block hasCustomPragmaGeneric:
+  template examplePragma() {.pragma.}
+  type
+    Foo[T] {.examplePragma.} = object
+      x {.examplePragma.}: T
+  var f: Foo[string]
+  doAssert f.hasCustomPragma(examplePragma)
+  doAssert f.x.hasCustomPragma(examplePragma)
+
+block getCustomPragmaValGeneric:
+  template examplePragma(x: int) {.pragma.}
+  type
+    Foo[T] {.examplePragma(42).} = object
+      x {.examplePragma(25).}: T
+  var f: Foo[string]
+  doAssert f.getCustomPragmaVal(examplePragma) == 42
+  doAssert f.x.getCustomPragmaVal(examplePragma) == 25