Bug 8907 – Selective import of a symbol after its first usage causes errors (including ICE)

--- import core.stdc.config; void f(c_ulong) { } import core.stdc.config: c_ulong; void main() { f(3); // line 9 } --- Compiler output: --- main.d(9): Error: function main.f (c_ulong _param_0) is not callable using argument types (int) main.d(9): Error: forward reference to type c_ulong main.d(9): Error: cannot implicitly convert expression (3) of type int to c_ulong --- --- import core.stdc.config; c_ulong a; import core.stdc.config: c_ulong; void main() { a = 3; } --- Compiler output: --- Assertion failure: 'fd && fd->inferRetType' on line 81 in file 'mangle.c' ---

The root cause is same as bug 9514, and test cases work with 2.053a. *** This issue has been marked as a duplicate of issue 9514 ***