import foo {.all.} reboot (#17706)

tests/importalls/mt8.nim

@@ -0,0 +1,23 @@
+#[
+test multiple imports
+]#
+
+{.warning[UnusedImport]: off.}
+import ./m1, m2 {.all.}, ./m3 {.all.}
+  # make sure this keeps using `import ./m1` without as.
+
+# m1 is regularly imported
+doAssert declared(m1.foo0)
+doAssert declared(foo0)
+
+doAssert not declared(m1.foo1)
+  # if we didn't call `createModuleAlias` even for `import f1 {.all.}`,
+  # this would fail, see D20201209T194412.
+
+# m2
+doAssert declared(m2.bar2)
+doAssert declared(bar2)
+
+# m3
+doAssert declared(m3.m3h2)
+doAssert declared(m3h2)