Extended Description

Code & Output cached in http://gist.github.com/597890. With r114794 the attached file causes:
stephen@hanuman:~/ise/production$ ~/dev/bin/clang test.cpp
clang: SemaTemplateInstantiate.cpp:962: clang::TypeSourceInfo* clang::Sema::SubstType(clang::TypeSourceInfo*, const clang::MultiLevelTemplateArgumentList&, clang::SourceLocation, clang::DeclarationName): Assertion `!ActiveTemplateInstantiations.empty() && "Cannot perform an instantiation without some context on the " "instantiation stack"' failed.
0 clang 0x000000000214fe41
1 clang 0x000000000214fc34
2 libpthread.so.0 0x00007f341098d8f0
3 libc.so.6 0x00007f340fc7ca75 gsignal + 53
4 libc.so.6 0x00007f340fc805c0 abort + 384
5 libc.so.6 0x00007f340fc75941 __assert_fail + 241
6 clang 0x000000000138b086 clang::Sema::SubstType(clang::TypeSourceInfo*, clang::MultiLevelTemplateArgumentList const&, clang::SourceLocation, clang::DeclarationName) + 132
7 clang 0x000000000138b587 clang::Sema::SubstParmVarDecl(clang::ParmVarDecl*, clang::MultiLevelTemplateArgumentList const&) + 127
8 clang 0x000000000138aca4
9 clang 0x000000000139160d
10 clang 0x000000000138de9a
11 clang 0x000000000138ac5d
12 clang 0x000000000138e7fa
13 clang 0x000000000138e268
14 clang 0x0000000001390c35
15 clang 0x000000000138d2e7 clang::Sema::Subst(clang::TemplateArgumentLoc const&, clang::TemplateArgumentLoc&, clang::MultiLevelTemplateArgumentList const&) + 105
16 clang 0x0000000001380e50
17 clang 0x0000000001384d4e clang::Sema::getMoreSpecializedPartialSpecialization(clang::ClassTemplatePartialSpecializationDecl*, clang::ClassTemplatePartialSpecializationDecl*, clang::SourceLocation) + 348
18 clang 0x000000000138c4dd clang::Sema::InstantiateClassTemplateSpecialization(clang::SourceLocation, clang::ClassTemplateSpecializationDecl*, clang::TemplateSpecializationKind, bool) + 889
19 clang 0x00000000013bb1a5 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, clang::PartialDiagnostic const&, std::pair<clang::SourceLocation, clang::PartialDiagnostic>) + 317
20 clang 0x00000000013bb623 clang::Sema::RequireCompleteType(clang::SourceLocation, clang::QualType, unsigned int) + 167
21 clang 0x0000000001243bb6 clang::Sema::ActOnUninitializedDecl(clang::Decl*, bool) + 1344
22 clang 0x00000000011aaec5 clang::Parser::ParseDeclarationAfterDeclarator(clang::Declarator&, clang::Parser::ParsedTemplateInfo const&) + 2363
23 clang 0x00000000011aa2bd clang::Parser::ParseDeclGroup(clang::Parser::ParsingDeclSpec&, unsigned int, bool, clang::SourceLocation*) + 741
24 clang 0x00000000011a9fb7 clang::Parser::ParseSimpleDeclaration(unsigned int, clang::SourceLocation&, clang::AttributeList*, bool) + 399
25 clang 0x00000000011a9dec clang::Parser::ParseDeclaration(unsigned int, clang::SourceLocation&, clang::CXX0XAttributeList) + 896
26 clang 0x0000000001199419 clang::Parser::ParseStatementOrDeclaration(bool) + 737
27 clang 0x000000000119a4d6 clang::Parser::ParseCompoundStatementBody(bool) + 248
28 clang 0x000000000119de0d clang::Parser::ParseFunctionStatementBody(clang::Decl*) + 115
29 clang 0x00000000011a40ab clang::Parser::ParseFunctionDefinition(clang::Parser::ParsingDeclarator&, clang::Parser::ParsedTemplateInfo const&) + 1069
30 clang 0x00000000011aa1d6 clang::Parser::ParseDeclGroup(clang::Parser::ParsingDeclSpec&, unsigned int, bool, clang::SourceLocation*) + 510
31 clang 0x00000000011a3bf4 clang::Parser::ParseDeclarationOrFunctionDefinition(clang::Parser::ParsingDeclSpec&, clang::AttributeList*, clang::AccessSpecifier) + 1058
32 clang 0x00000000011a3c5f clang::Parser::ParseDeclarationOrFunctionDefinition(clang::AttributeList*, clang::AccessSpecifier) + 95
33 clang 0x00000000011a35bf clang::Parser::ParseExternalDeclaration(clang::CXX0XAttributeList, clang::Parser::ParsingDeclSpec*) + 1681
34 clang 0x00000000011a2e9f clang::Parser::ParseTopLevelDecl(clang::OpaquePtrclang::DeclGroupRef&) + 267
35 clang 0x000000000118cc88 clang::ParseAST(clang::Sema&, bool) + 328
36 clang 0x0000000000f0b020 clang::ASTFrontendAction::ExecuteAction() + 264
37 clang 0x000000000102b114 clang::CodeGenAction::ExecuteAction() + 988
38 clang 0x0000000000f0ac6a clang::FrontendAction::Execute() + 320
39 clang 0x0000000000ef4e68 clang::CompilerInstance::ExecuteAction(clang::FrontendAction&) + 752
40 clang 0x0000000000ea8aec clang::ExecuteCompilerInvocation(clang::CompilerInstance*) + 856
41 clang 0x0000000000e9bf5f cc1_main(char const**, char const**, char const*, void*) + 958
42 clang 0x0000000000ea48fa main + 499
43 libc.so.6 0x00007f340fc67c4d __libc_start_main + 253
44 clang 0x0000000000e9b619
Stack dump:
0. Program arguments: /home/stephen/dev/bin/clang -cc1 -triple x86_64-unknown-linux-gnu -S -disable-free -main-file-name test.cpp -mrelocation-model static -mdisable-fp-elim -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-linker-version 2.20.1 -resource-dir /home/stephen/dev/lib/clang/2.9 -ferror-limit 19 -fmessage-length 179 -fexceptions -fgnu-runtime -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/cc-tl45qE.s -x c++ test.cpp

1. test.cpp:22:34: current parser token ';'
2. test.cpp:21:1: parsing function body 'main'
3. test.cpp:21:1: in compound statement ('{}')
   clang: error: clang frontend command failed due to signal 6 (use -v to see invocation)