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cmd/compile: TestScript/embedbad failures #76520

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#!watchflakes
default <- pkg == "cmd/compile" && test == "TestScript/embedbad"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestScript/embedbad
=== PAUSE TestScript/embedbad
=== CONT  TestScript/embedbad
    run.go:223: 2025-11-03T18:12:54Z
    run.go:225: $WORK=/Users/swarming/.swarming/w/ir/x/t/TestScriptembedbad1392940906/001
    run.go:232: 
        BOTO_CONFIG=/Users/swarming/.swarming/w/ir/x/a/gsutil-bbagent/.boto
        CIPD_ARCHITECTURE=amd64
        CIPD_CACHE_DIR=/Users/swarming/.swarming/w/ir/cache/cipd_cache
        CIPD_PROTOCOL=v2
...
        fatal error: fault
        [signal SIGSEGV: segmentation violation code=0x1 addr=0x20000a312e60 pc=0x9f287ac]
        
        goroutine 1 gp=0x24579f09c1c0 m=0 mp=0xaa2fe80 [running]:
        runtime.throw({0xa015753?, 0x9f16240?})
        	../../../w/goroot/src/runtime/panic.go:1227 +0x48 fp=0x24579f666d88 sp=0x24579f666d58 pc=0x9614cc8
        runtime.sigpanic()
        	../../../w/goroot/src/runtime/signal_unix.go:939 +0x26a fp=0x24579f666de8 sp=0x24579f666d88 pc=0x9616a6a
        cmd/compile/internal/types2.(*Checker).validVarType.func1()
        	../../../w/goroot/src/cmd/compile/internal/types2/typexpr.go:176 +0x2c fp=0x24579f666ea0 sp=0x24579f666de8 pc=0x9f287ac
...
        runtime.runCleanups()
        	../../../w/goroot/src/runtime/mcleanup.go:635 +0x45 fp=0x1f05063107e0 sp=0x1f05063107a0 pc=0xe9c5585
        runtime.goexit({})
        	../../../w/goroot/src/runtime/asm_amd64.s:1712 +0x1 fp=0x1f05063107e8 sp=0x1f05063107e0 pc=0xea34a41
        created by runtime.(*cleanupQueue).createGs in goroutine 1
        	../../../w/goroot/src/runtime/mcleanup.go:589 +0xa5
        [exit status 1]
        > stderr 'multiple files for type string'
    run.go:232: FAIL: testdata/script/embedbad.txt:4: stderr 'multiple files for type string': no match for `(?m)multiple files for type string` in stderr
--- FAIL: TestScript/embedbad (10.61s)

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    NeedsInvestigationSomeone must examine and confirm this is a valid issue and not a duplicate of an existing one.OS-DarwinWaitingForInfoIssue is not actionable because of missing required information, which needs to be provided.compiler/runtimeIssues related to the Go compiler and/or runtime.

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