[llvm-bugs] [Bug 148675] [flang] Unexpected compile time failure when resolving a reference to a defined assignment `ASSIGNMENT(=)`

[LLVM Bugs via llvm-bugs]

Issue	148675
Summary	[flang] Unexpected compile time failure when resolving a reference to a defined assignment `ASSIGNMENT(=)`
Labels	flang:frontend
Assignees
Reporter	DanielCChen

    Consider the following code:
```
module m
  type dt
    integer i
  contains
 generic :: ASSIGNMENT(=) => assign
    procedure, pass :: assign => myassign
    generic :: ASSIGNMENT(=) => otherassign               !! If commented out, it compiles successfully
    procedure, pass :: otherassign => myassign            !! If commented out, it compiles successfully
  end type
contains
  subroutine myassign(x,y)
    class(dt), intent(out) :: x
 integer, intent(in) :: y
    x%i = y + 1
  end subroutine

 subroutine sub
    type(dt) xdt
    xdt = 5
  end subroutine
end module
```

Flang complains:
```
error: Semantic errors in assign08.f
./assign08.f:19:5: error: No intrinsic or user-defined ASSIGNMENT(=) matches operand types TYPE(dt) and INTEGER(4)
      xdt = 5
 ^^^^^^^
```

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