[GHC] #14591: HEAD panic: tcSyntaxOp "noSyntaxExpr"
#14591: HEAD panic: tcSyntaxOp "noSyntaxExpr" -------------------------------------+------------------------------------- Reporter: tianxiaogu | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Keywords: | Operating System: Linux Architecture: | Type of failure: Compile-time Unknown/Multiple | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- The following program triggers a bug in 8.2.2 and 8.5.20171215. {{{#!hs -- Checks that the ordering constraint on the groupWith function is respected {-# OPTIONS_GHC -XMonadComprehensions -XTransformListComp #-} module ShouldFail where import GHC.Exts (groupWith) data Unorderable = Gnorf | Pinky | Brain foo = [ () | Gnorf <- [Gnorf, Brain] , then group by x using groupWith ] }}} Reproduce: {{{ ghc bug.hs }}} Output: {{{ [1 of 1] Compiling ShouldFail ( bug.hs, bug.o ) ghc: panic! (the 'impossible' happened) (GHC version 8.5.20171215 for x86_64-unknown-linux): tcSyntaxOp "noSyntaxExpr" Call stack: CallStack (from HasCallStack): callStackDoc, called at compiler/utils/Outputable.hs:1150:37 in ghc:Outputable pprPanic, called at compiler/typecheck/TcExpr.hs:1436:31 in ghc:TcExpr Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug}}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14591 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#14591: HEAD panic: tcSyntaxOp "noSyntaxExpr" -------------------------------------+------------------------------------- Reporter: tianxiaogu | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: | Keywords: Operating System: Linux | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by tianxiaogu): * Attachment "bug.hs" added. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14591 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
#14591: HEAD panic: tcSyntaxOp "noSyntaxExpr"
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Reporter: tianxiaogu | Owner: (none)
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 8.2.2
Resolution: | Keywords:
Operating System: Linux | Architecture:
Type of failure: Compile-time | Unknown/Multiple
crash or panic | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by Simon Peyton Jones
#14591: HEAD panic: tcSyntaxOp "noSyntaxExpr" -------------------------------------+------------------------------------- Reporter: tianxiaogu | Owner: (none) Type: bug | Status: closed Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Resolution: fixed | Keywords: Operating System: Linux | Architecture: | Unknown/Multiple Type of failure: Compile-time | Test Case: crash or panic | rename/should_fail/T14591 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * status: new => closed * testcase: => rename/should_fail/T14591 * resolution: => fixed -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14591#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler
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