By specifying `*` instead of a label or an import list after an `import`
keyword, all of the modules exports are aggregated into an object whose
keys and values refer to the exported names and their corresponding
values respectively.

-- Testcase --
import * as mod from "./files/test1.uc";

print(mod, "\n");
-- End --

-- File test1.uc --
export const a = 1, b = 2, c = 3;
export default a + b + c;
-- End --

-- Args --
-R
-- End --

-- Expect stdout --
{ "a": 1, "b": 2, "c": 3, "default": 6 }
-- End --


When using the wildcard import syntax, assigning a name using the `as`
expression is mandatory.

-- Testcase --
import * from "./files/test2.uc";
-- End --

-- File test2.uc --
export const x = "This is a test";
-- End --

-- Args --
-R
-- End --

-- Expect stderr --
Syntax error: Unexpected token
Expecting 'as'
In line 1, byte 10:

 `import * from "./files/test2.uc";`
           ^-- Near here


-- End --


A wildcard expression may follow a default import expression in an `import`
statment.

-- Testcase --
import defVal, * as mod from "./files/test3.uc";

print([defVal, mod], "\n");
-- End --

-- File test3.uc --
export const a = 1, b = 2, c = 3;
export default a + b + c;
-- End --

-- Args --
-R
-- End --

-- Expect stdout --
[ 6, { "a": 1, "b": 2, "c": 3, "default": 6 } ]
-- End --