Section 9,2,1: Severe_Messages

 Must be corrected.  The program's execution is terminated when the
 error is encountered, unless for I/O statements the program uses
 the END or ERR I/O statement specifiers to transfer control,
 perhaps to a routine that uses the IOSTAT specifier (see your DEC
 Fortran user manual).

 The severe messages follow (in alphabetical order):

  o  MESSAGE:  Adjustable array dimension error

     NUMBER:  93

     EXPLANATION:  Upon entry to a subprogram, one of the following
     errors was detected during the evaluation of dimensioning
     information:

        - An upper-dimension bound was less than a 
          lower-dimension bound.
        - The dimensions implied an array that was larger 
          than addressable memory.

  o  MESSAGE:  Attempt to access non-existent record

     NUMBER:  36

     EXPLANATION:  A direct-access READ or FIND statement attempted
     to access beyond the end of a relative file (or a sequential
     file on disk with fixed-length records) or access a record that
     was previously deleted in a relative file.

  o  Array index out of bounds (SIGTRAP)

     NUMBER:  138

     EXPLANATION:  Break exception generated a SIGTRAP signal
     (described in signal(3)).  Core dump file created.

     The cause is an array subscript that is outside the dimensioned
     boundaries of that array.  Try recompiling using the -check
     bounds option (perhaps with the f77_dump_flag environment
     variable set) or examine the core dump file to determine the
     source code in error.

  o  MESSAGE:  Array index out of bounds for index n (SIGTRAP)

     NUMBER:  139

     EXPLANATION:  Break exception generated a SIGTRAP signal
     (described in signal(3)).  Core dump file created.

     The cause is an array subscript that is outside the dimensioned
     boundaries of the array index n.  Try recompiling using the
     -check bounds option (perhaps with the f77_dump_flag
     environment variable set) or examine the core dump file to
     determine the source code in error.

  o  MESSAGE:  BACKSPACE error

     NUMBER:  23

     EXPLANATION:  An error condition was detected during execution
     of a BACKSPACE statement.

  o  MESSAGE:  Cannot overwrite existing file

     NUMBER:  10

     EXPLANATION:  Specified file xxx already exists when OPEN
     statement specified STATUS='NEW' (create new file) using I/O
     unit x.  Make sure correct file name, directory path, unit, and
     so forth were specified in the source program.  Decide whether
     to:

        - Rename or remove the existing file before rerunning 
          the program.
        - Modify the source file to specify different file 
          specification, I/O unit, or OPEN statement STATUS='UNKNOWN'.

  o  MESSAGE:  Cannot stat file

     NUMBER:  108

     EXPLANATION:  Attempted stat operation on the indicated file
     failed.  Make sure correct file and unit were specified.

  o  MESSAGE:  CLOSE error

     NUMBER:  28

     EXPLANATION:  An error condition was detected by the DEC
     Fortran RTL I/O system during execution of a CLOSE statement.

  o  MESSAGE:  DELETE error

     NUMBER:  55

     EXPLANATION:  An error condition was detected by the DEC
     Fortran RTL I/O system during execution of a DELETE statement.

  o  MESSAGE:  Divide by zero check (SIGTRAP)

     NUMBER:  137

     EXPLANATION:  Break exception generated a SIGTRAP signal
     (described in signal(3)).  Core dump file created.

     Examine core dump file for possible cause.

  o  MESSAGE:  Duplicate file specifications

     NUMBER:  21

     EXPLANATION:  Multiple attempts were made to specify file
     attributes without an intervening close operation.  A DEFINE
     FILE statement was followed by another DEFINE FILE statement or
     an OPEN statement.

  o  MESSAGE:  ENDFILE error

     NUMBER:  33

     EXPLANATION:  One of the following conditions occurred:

        - The file was not a sequential organization file with 
          variable-length records.

        - The file was not opened for sequential or append access.

        - An unformatted file did not contain segmented records.

        - The DEC Fortran RTL I/O system detected an error during 
          execution of an ENDFILE statement. 

  o  MESSAGE:  End-of-file during read

     NUMBER:  24

     EXPLANATION:  One of the following conditions occurred:

        - A DEC Fortran RTL I/O system end-of-file condition
          was encountered during execution of a READ statement 
          that did not contain an END, ERR, or IOSTAT specification. 

        - An end-of-file record written by the ENDFILE statement 
          was encountered during execution of a READ statement 
          that did not contain an END, ERR, or IOSTAT specification.

        - An attempt was made to read past the end of an internal 
          file character string or array during execution of a READ 
          statement that did not contain an END, ERR, or IOSTAT 
          specification.

  o  MESSAGE:  Error during read

     NUMBER:  39

     EXPLANATION:  The DEC Fortran RTL I/O system detected an error
     condition during execution of a READ statement.

  o  MESSAGE:  Error during write

     NUMBER:  38

     EXPLANATION:  The DEC Fortran RTL I/O system detected an error
     condition during execution of a WRITE statement.

  o  MESSAGE:  File name specification error

     NUMBER:  43

     EXPLANATION:  The file name was specified erroneously.

  o  MESSAGE:  File not found

     NUMBER:  29

     EXPLANATION:  A file with the specified name could not be found
     during an open operation.

  o  MESSAGE:  FIND error

     NUMBER:  57

     EXPLANATION:  The DEC Fortran RTL I/O system detected an error
     condition during execution of a FIND statement.

  o  MESSAGE:  Floating overflow in math library

     NUMBER:  88

     EXPLANATION:  A floating-point overflow condition was detected
     during execution of a math library procedure.

  o  MESSAGE:  Floating underflow in math library

     NUMBER:  89

     EXPLANATION:  A floating-point underflow condition was detected
     during execution of a math library procedure.  The result
     returned was zero.

  o  MESSAGE:  Format/variable-type mismatch

     NUMBER:  61

     EXPLANATION:  An attempt was made either to read or write a
     real variable with an integer field descriptor (I or L), or to
     read or write an integer or logical variable with a real field
     descriptor (D, E, F, or G).

  o  MESSAGE:  Formatted I/O to unit open for unformatted transfers

     NUMBER:  257

     EXPLANATION:  Attempted formatted I/O (such as list-directed or
     namelist I/O) to a unit where the OPEN statement indicated the
     file was unformatted (FORM keyword).  Check that the correct
     unit (file) was specified.

     If the FORM keyword was not specified in the OPEN statement and
     the file should contain formatted data, specify
     FORM='FORMATTED' in the OPEN statement.  Otherwise, if
     appropriate, use unformatted I/O.

  o  MESSAGE:  Inconsistent file organization

     NUMBER:  51

     EXPLANATION:  The file organization specified in an OPEN
     statement did not match the organization of the existing file.

  o  MESSAGE:  Inconsistent OPEN/CLOSE parameters

     NUMBER:  46

     EXPLANATION:  Specifications in an OPEN or CLOSE statement were
     inconsistent.  Some invalid combinations follow:

        - READONLY with STATUS='NEW' or STATUS='SCRATCH'

        - ACCESS='APPEND' with READONLY, STATUS='NEW' or
          STATUS='SCRATCH'

        - DISPOSE='SAVE', 'PRINT', or 'SUBMIT' with
          STATUS='SCRATCH'

        - DISPOSE='DELETE' with READONLY

  o  MESSAGE:  Inconsistent record length

     NUMBER:  37

     EXPLANATION:  An attempt was made to open a direct access file
     without specifying a record length.

  o  MESSAGE:  Inconsistent record type

     NUMBER:  44

     EXPLANATION:  The RECORDTYPE value in an OPEN statement did not
     match the record type attribute of the existing file that was
     opened.

  o  MESSAGE:  Infinite format loop

     NUMBER:  60

     EXPLANATION:  The format associated with an I/O statement that
     included an I/O list had no field descriptors to use in
     transferring those values.

  o  MESSAGE:  Input conversion error

     NUMBER:  64

     EXPLANATION:  During a formatted input operation, an invalid
     character was detected in an input field, or the input value
     overflowed the range representable in the input variable.  The
     value of the variable was set to zero.

  o  MESSAGE:  Input record too long

     NUMBER:  22

     EXPLANATION:  A record was read that exceeded the explicit or
     default record length specified when the file was opened.  To
     read the file, use an OPEN statement with a RECL= value (record
     length) of the appropriate size.

  o  MESSAGE:  Input statement requires too much data

     NUMBER:  67

     EXPLANATION:  An unformatted READ statement attempted to read
     more data than existed in the record being read.

  o  MESSAGE:  Insufficient virtual memory

     NUMBER:  41

     EXPLANATION:  The DEC Fortran RTL was unable to acquire
     additional virtual memory from the operating system.  Users of
     the C and Korn shells may be able to overcome this problem by
     increasing the per-process data limit using the limit (C shell)
     or ulimit (Korn shell) commands.  For more information, see the
     csh(1) and ksh(1) reference pages.

     If the maximum per-process data size is already allocated,
     increase the value of the maxdsiz parameter in the system's
     configuration file.  Note that edits to the configuration file
     do not take effect until the operating system kernel has been
     rebuilt, and the system has been rebooted.  For more
     information, see the doconfig(1) reference page and your
     operating system guide to system configuration.

  o  MESSAGE:  Integer overflow

     NUMBER:  70

     EXPLANATION:  During an arithmetic operation, an integer value
     exceeded byte, word, or longword range.  The result of the
     operation was the correct low-order part.  See your DEC Fortran
     user manual for ranges of the various integer data types.

  o  MESSAGE:  Integer zero divide

     NUMBER:  71

     EXPLANATION:  During an integer arithmetic operation, an
     attempt was made to divide by zero.  The result of the
     operation was set to the dividend, which is equivalent to
     division by 1.

  o  MESSAGE:  Internal consistency check failure

     NUMBER:  8

     EXPLANATION:  Internal severe error.  Please check that the
     program is correct.  Recompile if an error exists in the
     program.

     If this error persists, submit an SPR.

  o  MESSAGE:  Invalid argument to Fortran Run-Time Library

     NUMBER:  48

     EXPLANATION:  The compiler passed an invalid or improperly
     coded argument to the DEC Fortran RTL.  This can occur if the
     compiler is newer than the RTL in use.

  o  MESSAGE:  Invalid argument to math library

     NUMBER:  81

     EXPLANATION:  One of the mathematical procedures detected an
     invalid argument value.

  o  MESSAGE:  Invalid logical unit number

     NUMBER:  32

     EXPLANATION:  A logical unit number greater than or less than
     zero was used in an I/O statement.

  o  MESSAGE:  Invalid reference to variable in NAMELIST input

     NUMBER:  19

     EXPLANATION:  One of the following conditions occurred:

        - The variable was not a member of the namelist group.

        - An attempt was made to subscript the scalar variable.

        - A subscript of the array variable was out-of-bounds.

        - An array variable was specified with too many or too 
          few subscripts for the variable. 

        - An attempt was made to specify a substring of a non-
          character variable or array name.

        - A substring specifier of the character variable was 
          out-of-bounds.

        - A subscript or substring specifier of the variable was 
          not an integer constant.

        - An attempt was made to specify a substring using an 
          unsubscripted array variable. 

  o  MESSAGE:  Kernel breakpoint (SIGTRAP)

     NUMBER:  131

     EXPLANATION:  Break exception generated a SIGTRAP signal
     (described in signal(3)).  Core dump file created.

     Examine core dump for possible cause.

  o  MESSAGE:  Keyword value error in OPEN statement

     NUMBER:  45

     EXPLANATION:  An improper value was specified for an OPEN or
     CLOSE statement keyword requiring a value.

  o  MESSAGE:  List-directed I/O syntax error

     NUMBER:  59

     EXPLANATION:  The data in a list-directed input record had an
     invalid format, or the type of the constant was incompatible
     with the corresponding variable.  The value of the variable was
     unchanged.

  o  MESSAGE:  Logarithm of zero or negative value

     NUMBER:  83

     EXPLANATION:  An attempt was made to take the logarithm of zero
     or a negative number.  The result returned was the reserved
     operand, -0.

  o  MESSAGE:  Mixed file access modes

     NUMBER:  31

     EXPLANATION:  An attempt was made to use any of the following
     combinations:

        - Formatted and unformatted operations on the same unit.

        - An invalid combination of access modes on a unit, 
          such as direct and sequential.

        - A DEC Fortran RTL I/O statement on a logical unit that 
          was opened by a program coded in another language.

  o  MESSAGE:  No such device

     NUMBER:  42

     EXPLANATION:  A pathname included an invalid or unknown device
     name when an OPEN operation was attempted.

  o  MESSAGE:  Not a Fortran-specific error

     NUMBER:  1

     EXPLANATION:  An error occurred in the user program or in the
     RTL that was not a DEC Fortran-specific error.

  o  MESSAGE:  Not taken branch delay emulation (SIGTRAP)

     NUMBER:  134

     EXPLANATION:  Break exception generated a SIGTRAP signal
     (described in signal(3)).  Core dump file created.

     Examine core dump for possible cause.

  o  MESSAGE:  OPEN or DEFINE FILE required

     NUMBER:  26

     EXPLANATION:  A direct access READ, WRITE, or FIND, statement
     was attempted for a file when no DEFINE FILE or OPEN statement
     with ACCESS='DIRECT' was performed for that file.

  o  MESSAGE:  Open failure

     NUMBER:  30

     EXPLANATION:  An error was detected by the DEC Fortran RTL I/O
     system while attempting to open a file in an OPEN, INQUIRE, or
     other I/O statement.  This message is issued when the error
     condition is not one of the more common conditions for which
     specific error messages are provided.  It can occur if an OPEN
     operation is attempted for one of the following files:

        - A segmented file that was not on a disk or a raw 
          magnetic tape.
        - A standard I/O file that had been closed.

  o  MESSAGE:  Operation requires seek ability

     NUMBER:  120

     EXPLANATION:  Attempted an operation on a file that requires
     the ability to perform seeks on that file.  Make sure the
     correct unit, directory path, and file were specified.

  o  MESSAGE:  Output statement overflows record

     NUMBER:  66

     EXPLANATION:  An output statement attempted to transfer more
     data than would fit in the maximum record size.

  o  MESSAGE:  Overflow check (SIGTRAP)

     NUMBER:  136

     EXPLANATION:  Break exception generated a SIGTRAP signal
     (described in signal(3)).  Core dump file created.

     The cause is an integer overflow.  Try recompiling using the
     -check overflow option (perhaps with the f77_dump_flag
     environment variable set) or examine the core dump file to
     determine the source code in error.

  o  MESSAGE:  Pathname error

     NUMBER:  43

     EXPLANATION:  A pathname (or file name) given to an OPEN or
     INQUIRE statement was not acceptable to the DEC Fortran RTL I/O
     system.

  o  MESSAGE:  Permission to access file denied, unit x, file xxx

     NUMBER:  9

     EXPLANATION:  Check the mode (protection) of the specified
     file.  Make sure the correct file was being accessed.  Change
     the protection, specified file, or process used before
     rerunning program.

  o  MESSAGE:  Record number outside range

     NUMBER:  25

     EXPLANATION:  A direct access READ, WRITE, or FIND statement
     specified a record number outside the range specified when the
     file was opened.

  o  MESSAGE:  Recursive I/O operation

     NUMBER:  40

     EXPLANATION:  While processing an I/O statement for a logical
     unit, another I/O operation on the same logical unit was
     attempted, such as a function subprogram that performs I/O to
     the same logical unit was referenced in an expression in an I/O
     list or variable format expression.

  o  MESSAGE:  REWIND error

     NUMBER:  20

     EXPLANATION:  One of the following conditions occurred:

        - The file was not a sequential file.

        - The file was not opened for sequential or append access.

        - The DEC Fortran RTL I/O system detected an error condition  
          during execution of a REWIND statement. 

  o  MESSAGE:  Segmented record format error

     NUMBER:  35

     EXPLANATION:  An invalid segmented record control data word was
     detected in an unformatted sequential file.  The file was
     probably either created with RECORDTYPE='FIXED' or 'VARIABLE'
     in effect, or was created by a program written in a language
     other than Fortran.

  o  MESSAGE:  Significance lost in math library

     NUMBER:  87

     EXPLANATION:  The magnitude of an argument or the magnitude of
     the ratio of the arguments to a math library function was so
     large that all significance in the result was lost.  The result
     returned was the reserved operand, -0.

  o  MESSAGE:  Square root of negative value

     NUMBER:  84

     EXPLANATION:  An argument required the evaluation of the square
     root of a negative value.  The result returned was the reserved
     operand, -0.

  o  MESSAGE:  Subscript out of range

     NUMBER:  77

     EXPLANATION:  An array reference was detected outside the
     declared array bounds.

  o  MESSAGE:  Syntax error in format

     NUMBER:  62

     EXPLANATION:  A syntax error was encountered while the RTL was
     processing a format stored in an array or character variable.

  o  MESSAGE:  Syntax error in NAMELIST input

     NUMBER:  17

     EXPLANATION:  The syntax of input to a namelist READ statement
     was incorrect.

  o  MESSAGE:  Taken branch delay emulation (SIGTRAP)

     NUMBER:  133

     EXPLANATION:  Break exception generated a SIGTRAP signal
     (described in signal(3)).  Core dump file created.

     Examine core dump for possible cause.

  o  MESSAGE:  Too many records in I/O statement

     NUMBER:  27

     EXPLANATION:  An attempt was made to do one of the following:

        - Read or write more than one record with an ENCODE
          or DECODE statement.
        - Write more records than existed.

  o  MESSAGE:  Too many values for NAMELIST variable

     NUMBER:  18

     EXPLANATION:  An attempt was made to assign too many values to
     a variable during a namelist READ statement.

  o  MESSAGE:  Undefined exponentiation

     NUMBER:  82

     EXPLANATION:  An exponentiation that is mathematically
     undefined was attempted, for example, 0.**0.  The result
     returned for floating-point operations was the reserved
     operand, -0, and for integer operations, zero.

  o  MESSAGE:  Unformatted I/O to unit open for formatted transfers

     NUMBER:  256

     EXPLANATION:  Attempted unformatted I/O to a unit where the
     OPEN statement indicated the file was formatted (FORM keyword).
     Check that the correct unit (file) was specified.

     If the FORM keyword was not specified in the OPEN statement and
     the file should contain unformatted data, specify
     FORM='UNFORMATTED' in the OPEN statement.  Otherwise, if
     appropriate, use formatted I/O (such as list-directed or
     namelist I/O).

  o  MESSAGE:  Unit already open

     NUMBER:  34

     EXPLANATION:  A DEFINE FILE statement specified a logical unit
     that was already opened.

  o  MESSAGE:  Unit not connected

     NUMBER:  11

     EXPLANATION:  The specified unit was not open at the time of
     the attempted I/O operation.  Check if correct unit number was
     specified.  If appropriate, use an OPEN statement to explicitly
     open the file (associates the file with the unit number).

  o  MESSAGE:  User breakpoint (SIGTRAP)

     NUMBER:  130

     EXPLANATION:  Break exception generated a SIGTRAP signal
     (described in signal(3)).  Core dump file created.

     Examine core dump for possible cause.

  o  MESSAGE:  User single step (SIGTRAP)

     NUMBER:  135

     EXPLANATION:  Break exception generated a SIGTRAP signal
     (described in signal(3)).  Core dump file created.

     Examine core dump for possible cause.

  o  MESSAGE:  Variable format expression value error

     NUMBER:  68

     EXPLANATION:  The value of a variable format expression was not
     within the range acceptable for its intended use; for example,
     a field width was less than or equal to zero.  A value of 1 was
     assumed, except for a P edit descriptor, for which a value of
     zero was assumed.

  o  MESSAGE:  Write to READONLY file

     NUMBER:  47

     EXPLANATION:  A write operation was attempted to a file that
     was declared READONLY in the OPEN statement that is currently
     in effect.

  o  MESSAGE:  Wrong number of arguments

     NUMBER:  80

     EXPLANATION:  An improper number of arguments was used to call
     a math library procedure.