[Issue 22577] New: ImportC: decay of function to typedef'd const function pointer causes ICE.

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22577

          Issue ID: 22577
           Summary: ImportC: decay of function to typedef'd const function
                    pointer causes ICE.
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: dave287091 at gmail.com

The following C program triggers an ICE:
---
typedef int(IntFunc)(void);

int one(void){
    return 1;
}
// Ok:
// int(*const func)(void) = one

// Also Ok:
// IntFunc* func = one;

// Also Ok:
// IntFunc* const func = &one;

// This causes an ICE
IntFunc* const func = one;


---                                                                             
ERROR: This is a compiler bug.                                                  
Please report it via https://issues.dlang.org/enter_bug.cgi                     
with, preferably, a reduced, reproducible example and the information below.    
DustMite (https://github.com/CyberShadow/DustMite/wiki) can help with the
reduction.                 
---                                                                             
DMD v2.098.0-76-g9dc7b9cea                                                      
predefs   DigitalMars LittleEndian D_Version2 all D_SIMD Posix ELFv1 linux
CRuntime_Glibc CppRuntime_
Gcc D_InlineAsm_X86_64 X86_64 D_LP64 D_PIC assert D_ModuleInfo D_Exceptions
D_TypeInfo D_HardFloat   
binary    generated/linux/release/64/dmd                                        
version   v2.098.0-76-g9dc7b9cea                                                
config    generated/linux/release/64/dmd.conf                                   
DFLAGS    -Igenerated/linux/release/64/../../../../../druntime/import
-Igenerated/linux/release/64/..
/../../../../phobos
-L-Lgenerated/linux/release/64/../../../../../phobos/generated/linux/release/64
-
L--export-dynamic -fPIC                                                         
---                                                                             
core.exception.AssertError at src/dmd/dcast.d(1030): Assertion failure             
----------------                                                                
??:? [0x563a6ef04c85]                                                           
??:? [0x563a6ef2d006]                                                           
??:? [0x563a6ef0d70f]                                                           
??:? [0x563a6ef03dd7]                                                           
src/dmd/dcast.d:1030 [0x563a6ed83bba]                                           
src/dmd/expression.d:5261 [0x563a6ecd52d7]                                      
src/dmd/dcast.d:1475 [0x563a6ecce14b]                                           
src/dmd/expression.d:1031 [0x563a6eb3384c]                                      
src/dmd/initsem.d:426 [0x563a6ec6edbc]                                          
src/dmd/initsem.d:887 [0x563a6eba2728]                                          
src/dmd/dsymbolsem.d:1125 [0x563a6ed1675d]                                      
src/dmd/declaration.d:1637 [0x563a6ed7cb97]                                     
src/dmd/dsymbolsem.d:104 [0x563a6eb9d0d3]                                       
src/dmd/dsymbolsem.d:1428 [0x563a6ed186cf]                                      
src/dmd/dsymbolsem.d:1440 [0x563a6ed1876c]                                      
src/dmd/parsetimevisitor.d:71 [0x563a6eb34264]                                  
src/dmd/attrib.d:433 [0x563a6eda54f7]                                           
src/dmd/dsymbolsem.d:104 [0x563a6eb9d0d3]                                       
src/dmd/dsymbolsem.d:1956 [0x563a6ed1afca]                                      
src/dmd/dsymbol.d:104 [0x563a6eb2e94f]                                          
src/dmd/dsymbolsem.d:1953 [0x563a6ed1af38]                                      
src/dmd/dmodule.d:1542 [0x563a6ec5d0e7]                                         
src/dmd/dsymbolsem.d:104 [0x563a6eb9d0d3]                                       
src/dmd/mars.d:474 [0x563a6edb260e]                                             
src/dmd/mars.d:1027 [0x563a6edbbf94]                                            
??:? [0x563a6ef0d3f7]                                                           
??:? [0x563a6ef0d2f4]                                                           
??:? [0x563a6ef0d14d]                                                           
src/dmd/mars.d:983 [0x563a6edbbf38]                                             
??:? __libc_start_main [0x7fedde2c50b2]                                         
??:? [0x563a6eb1edfd]

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