diff --git a/go/def.bzl b/go/def.bzl
index abeff7aac..49da04e9f 100644
--- a/go/def.bzl
+++ b/go/def.bzl
@@ -129,6 +129,10 @@ go_tool_library = _go_tool_library
 go_toolchain = _go_toolchain
 nogo = _nogo
 
+# This provider is deprecated and will be removed in a future release.
+# Use GoSource instead.
+GoLibrary = _GoSource
+
 # See go/providers.rst#GoSource for full documentation.
 GoSource = _GoSource
 
diff --git a/go/private/context.bzl b/go/private/context.bzl
index f86bc8bb5..1c7493410 100644
--- a/go/private/context.bzl
+++ b/go/private/context.bzl
@@ -238,6 +238,43 @@ def _dedup_deps(deps):
         deduped_deps.append(dep)
     return deduped_deps
 
+def _deprecated_new_library(go, name = None, importpath = None, resolver = None, importable = True, testfilter = None, is_main = False, **kwargs):
+    if not importpath:
+        importpath = go.importpath
+        importmap = go.importmap
+    else:
+        importmap = importpath
+    pathtype = go.pathtype
+    if not importable and pathtype == EXPLICIT_PATH:
+        pathtype = EXPORT_PATH
+
+    return struct(
+        name = go.label.name if not name else name,
+        label = go.label,
+        importpath = importpath,
+        importmap = importmap,
+        importpath_aliases = go.importpath_aliases,
+        pathtype = pathtype,
+        resolve = resolver,
+        testfilter = testfilter,
+        is_main = is_main,
+        **kwargs
+    )
+
+def _deprecated_library_to_source(go, attr, library, coverage_instrumented):
+    return new_source(
+        go,
+        attr,
+        name = library.name,
+        importpath = library.importpath,
+        resolver = library.resolve,
+        testfilter = library.testfilter,
+        is_main = library.is_main,
+        coverage_instrumented = coverage_instrumented,
+        generated_srcs = getattr(library, "srcs", []),
+        pathtype = library.pathtype,
+    )
+
 def new_source(
         go,
         attr,
@@ -296,6 +333,7 @@ def new_source(
         "cgo_deps": [],
         "cgo_exports": [],
         "cc_info": None,
+        "pgoprofile": getattr(attr, "pgoprofile", None),
     }
     if coverage_instrumented:
         source["cover"] = attr_srcs
@@ -309,7 +347,7 @@ def new_source(
     for k, v in getattr(attr, "x_defs", {}).items():
         v = _expand_location(go, attr, v)
         if "." not in k:
-            k = "{}.{}".format(source["importmap"], k)
+            k = "{}.{}".format(importmap, k)
         x_defs[k] = v
     source["x_defs"] = x_defs
     if not source["cgo"]:
@@ -562,6 +600,7 @@ def go_context(ctx, attr = None):
 
     _check_importpaths(ctx)
     importpath, importmap, pathtype = _infer_importpath(ctx, attr)
+    importpath_aliases = tuple(getattr(attr, "importpath_aliases", ()))
 
     return struct(
         # Fields
@@ -580,6 +619,7 @@ def go_context(ctx, attr = None):
         package_list = toolchain.sdk.package_list,
         importpath = importpath,
         importmap = importmap,
+        importpath_aliases = importpath_aliases,
         pathtype = pathtype,
         cgo_tools = cgo_tools,
         nogo = nogo,
@@ -602,6 +642,8 @@ def go_context(ctx, attr = None):
         args = _new_args,  # deprecated
         builder_args = _builder_args,
         tool_args = _tool_args,
+        new_library = _deprecated_new_library,
+        library_to_source = _deprecated_library_to_source,
         declare_file = _declare_file,
         declare_directory = _declare_directory,
 
diff --git a/go/private/rules/nogo.bzl b/go/private/rules/nogo.bzl
index ec6d13994..288a02912 100644
--- a/go/private/rules/nogo.bzl
+++ b/go/private/rules/nogo.bzl
@@ -65,10 +65,10 @@ def _nogo_impl(ctx):
     nogo_source = new_source(
         go,
         struct(
-            srcs = [struct(files = [nogo_main])],
             embed = [ctx.attr._nogo_srcs],
             deps = analyzer_archives,
         ),
+        generated_srcs = [nogo_main],
         name = go.label.name + "~nogo",
         importpath = "nogomain",
         pathtype = EXPORT_PATH,
diff --git a/go/private/rules/test.bzl b/go/private/rules/test.bzl
index 25eca2aa9..31ba3cedc 100644
--- a/go/private/rules/test.bzl
+++ b/go/private/rules/test.bzl
@@ -147,13 +147,13 @@ def _go_test_impl(ctx):
     test_source = new_source(
         go,
         struct(
-            srcs = [struct(files = [main_go])],
             deps = test_deps,
         ),
         name = go.label.name + "~testmain",
         importpath = "testmain",
         pathtype = INFERRED_PATH,
         is_main = True,
+        generated_srcs = [main_go],
         coverage_instrumented = False,
     )
     test_archive, executable, runfiles = go.binary(