[metapost] Uninitialized variable sometimes causing malformedTFM files

[Akira Kakuto]

> ! Inconsistent equation (off by 2.77794).
> <to be read again> 
>                    ;
> l.230 mm*bpppix_=2.83464;
>                               pt*bpppix_=0.99626;
> ? 

Confirmed.

The command mfplain seems to work:

#cat test1.mp
mode:=localfont;input cmr10.mf;
end.

mfplain test1

This is MetaPost, version 2.00 (TeX Live 2019/W32TeX) (kpathsea version 6.3.1)
(c:/usr/local/share/texmf-dist/metapost/base/mfplain.mp
Preloading the plain base, version 0.99: preliminaries,
basic constants and mathematical macros,
macros for converting units,
macros and tables for various modes of operation,
macros for drawing and filling,
macros for proof labels and rules,
macros for character and font administration,
and a few last-minute items.) (./test1.mp
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/cmr10.mf
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/cmbase.mf)
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/roman.mf
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/romanu.mf [65] [66] [67]
[68] [69] [70] [71] [72] [73] [74] [75] [76] [77] [78] [79] [80] [81] [82]
[83] [84] [85] [86] [87] [88] [89] [90])
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/romanl.mf [97] [98] [99]
[100] [101] [102] [103] [104] [105] [106] [107] [108] [109] [110] [111] [112]
[113] [114] [115] [116] [117] [118] [119] [120] [121] [122])
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/greeku.mf [0] [1] [2]
[3] [4] [5] [6] [7] [8] [9] [10])
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/romand.mf [48] [49] [50]
[51] [52] [53] [54] [55] [56] [57])
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/romanp.mf [36] [38] [63]
[62]) (c:/usr/local/share/texmf-dist/fonts/source/public/cm/romspl.mf [16]
[17] [25] [26] [27] [28])
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/romspu.mf [29] [30] [31])
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/punct.mf [33] [60] [35]
[37] [39] [40] [41] [42] [43] [44] [46] [47] [58] [59] [61] [64] [91] [93]
[96]) (c:/usr/local/share/texmf-dist/fonts/source/public/cm/accent.mf [18]
[19] [20] [21] [22] [23] [24] [32] [94] [95] [125] [126] [127])
(c:/usr/local/share/texmf-dist/fonts/source/public/cm/romlig.mf [11] [12] [13]
[14] [15]) (c:/usr/local/share/texmf-dist/fonts/source/public/cm/comlig.mf
[34] [45] [92] [123] [124]) ) ) )
Font metrics written on test1.tfm.
128 output files written: test1.0 .. test1.127
Transcript written on test1.log.

Best,
Akira