Bug 21398 – Name clash between import and method triggers a segfault

Created attachment 1810 segfault repro Hi, DMD has been acting up on this piece of code I have attached as reproduction. If, within main (in `app.d`), there is no reference to the custom types, then compilation and execution are fine. However as soon as I introduce one of the types I defined in `mem.d`, the compiler segfaults. I've caught a backtrace in gdb: #0 0x00005555557a1421 in _D3dmd6hdrgen13visitWithMaskFCQBc5mtype4TypehPSQBt4root9outbuffer9OutBufferPSQCxQCw11HdrGenStateZv () #1 0x00005555557a173b in _D3dmd6hdrgen13typeToBufferxFCQBc5mtype4TypePSQBs4root9outbuffer9OutBufferPSQCwQCv11HdrGenStateZv () #2 0x00005555556914f3 in Type::toChars() const () #3 0x00005555557bed49 in ExpressionSemanticVisitor::visit(CallExp*) () #4 0x00005555556f2e4c in StatementSemanticVisitor::visit(ExpStatement*) () #5 0x00005555556f383a in StatementSemanticVisitor::visit(CompoundStatement*) () #6 0x00005555556f4caf in StatementSemanticVisitor::visit(ScopeStatement*) () #7 0x00005555556f5fab in _D3dmd12statementsem15semanticNoScopeFCQBl9statement9StatementPSQCk6dscope5ScopeZQBr () #8 0x00005555557028b3 in StatementSemanticVisitor::visit(IfStatement*) () #9 0x00005555556f383a in StatementSemanticVisitor::visit(CompoundStatement*) () #10 0x000055555571e3bb in Semantic3Visitor::visit(FuncDeclaration*) () #11 0x00005555557276ba in Semantic3Visitor::visit(AggregateDeclaration*) () #12 0x000055555571c0e1 in Semantic3Visitor::visit(TemplateInstance*) () #13 0x00005555557fe0d8 in _D3dmd10dsymbolsem24templateInstanceSemanticFCQBs9dtemplate16TemplateInstancePSQCz6dscope5ScopePSQDr4root5array__T5ArrayTCQEq10expression10ExpressionZQBkZv () #14 0x00005555557b6fe4 in ExpressionSemanticVisitor::visit(ScopeExp*) () #15 0x00005555557be6c4 in ExpressionSemanticVisitor::visit(CallExp*) () #16 0x00005555557959c7 in _D3dmd7initsem9inferTypeFCQy4init11InitializerPSQBu6dscope5ScopeZ8visitExpMFCQCxQCa14ExpInitializerZQCx () #17 0x00005555557955bd in _D3dmd7initsem9inferTypeFCQy4init11InitializerPSQBu6dscope5ScopeZQBo () #18 0x000055555580c5fd in DsymbolSemanticVisitor::visit(VarDeclaration*) () #19 0x00005555557c1be1 in ExpressionSemanticVisitor::visit(DeclarationExp*) () #20 0x00005555556f2e4c in StatementSemanticVisitor::visit(ExpStatement*) () #21 0x00005555556f383a in StatementSemanticVisitor::visit(CompoundStatement*) () #22 0x000055555571e3bb in Semantic3Visitor::visit(FuncDeclaration*) () #23 0x000055555571c841 in Semantic3Visitor::visit(Module*) () #24 0x000055555576e380 in _D3dmd4mars7tryMainFmPPxaKSQz7globals5ParamZi () #25 0x000055555577889f in D main () As I am new with D, the code I wrote may not be correct, however I don't think compilers are supposed to find code so ugly they crash, lol.

> however I don't think compilers are supposed to find code so ugly they crash yes for this kind of bug you can add the "ICE" keyword. Just did it this time.

It seems the segfault is due in `mem.d` because I import `free`, but also at the same time declare a method of the same name. I have updated the title in consequence.

@BorisCarvajal created dlang/dmd pull request #11972 "Issue 21398 - Name clash between import and method triggers a segfault" mentioning this issue: - Issue 21398 - Name clash between import and method triggers a segfault https://github.com/dlang/dmd/pull/11972

dlang/dmd pull request #11972 "Issue 21398 - Name clash between import and method triggers a segfault" was merged into stable: - e4dc0ffa5a69d01308d68a4d50b8cfdbb9ba6911 by Boris Carvajal: Fix Issue 21398 - Name clash between import and method triggers a segfault https://github.com/dlang/dmd/pull/11972

dlang/dmd pull request #11985 "merge stable" was merged into master: - 9664fddc015541001dd31ae649b1f246f7ce73ef by Boris Carvajal: Fix Issue 21398 - Name clash between import and method triggers a segfault https://github.com/dlang/dmd/pull/11985